High Flow Aeration Units

Aeration is a powerful pre-treatment for filters removing iron, manganese and hydrogen sulfide. AerMax closed tank systems offer an efficient, economical, chemical-free method for oxidizing contaminants for easy removal by filtration.

Standard AerMax units come in one size — a 10″ X 54″ mineral tank powered by the standard 115V. or 230V. compressor. This unit is effective at flow rates up to nine or ten gallons per minute. The same compressor and installation parts can be used with larger 2.5 top hole tanks, 12″ X 52″ and 13″ X 54″, to make aeration units for treatment at flow rates up to 12 gpm and 14 gpm respectively.

For higher flow rates, we have larger units built on tanks with 4″ top holes and powered by the CAP high capacity air pump. The chart below shows aeration units up to 35 gpm using 65″ tanks.


The chart below shows units with flow rates from 12 to 35 gpm. It should be noted that the 65″ tank units contain the pump, installation kit, and the tank. The inner riser and inlet tube can be easily made with standard hardware store PVC parts. Complete instructions are included.

Tank Size


GPM Rating

Unit Price

12″ X 52″ (2.5″ top hole). Head is for standard 1″ pipe. Standard AP1 (115v. or AP2 (230 v.) 12

$799 (115v)

$859 (230v)

13″ X 54″ (2.5″ top hole).  Head is for standard 1″ pipe. Standard AP1 (115v. or AP2 (230 v.) 14

$849 (115v)

$909 (230v)

14″ X 65″ (4.0″ top hole). Head is for 1.5″ pipe. CAP 19 $1,254.00 (same price for 115 or 230 volt units)
16″ X 65″ (4.0″ top hole). Head is for 1.5″ pipe. CAP 26 $1,285.00  (same price for 115 or 230 volt units)
18″ X 65″ (4.0 top hole). Head is for 1.5″ pipe. CAP 35 $1,424.00  (same price for 115 or 230 volt units)

Prices above include shipping.  They are subject to change.



The high quality CAP high volume air pump used to power larger systems.  This quiet (65 decibel) 1/4 horsepower pump is available in 230v. or 115v. (This pump is also recommended for  all sizes of Aeraton systems installed on “constant pressure” wells.)

Higher flow rates can also be achieved by using two units in parallel.  For example, two standard 10″ x 54″ AerMax units can be installed in parallel for a combined flow rate of 18 gpm, and you could treat up to 70 gpm with two of the 18″ X 65″ units installed side by side.

TCP: 1, 2, 3-Trichloropropane

Posted June 16th, 2018

1, 2, 3-Trichloropropane (TCP) in California Water

TCP, or 1, 2, 3-Trichloropropane, has been found recently in the water of Tulare, CA in excess of the state’s newly established limit of 5 parts per trillion. Water from six wells in Tulare flunked the test for the cancer-causing chemical.

TCP is a waste product from making plastic. For years, it was added to fumigants that farmers put in the soil to kill tiny worms called nematodes.

To solve the TCP problem, the city will install water treatment tanks containing granular activated carbon that strip away the TCP.

Until last year, there was no state standard for the amount of TCP in drinking water, but last year the state said public water systems could have no more than 5 parts per trillion of TCP. The Tulare wells tested at 8 parts per trillion. The cancer risk is low. It is estimated that you would have to drink a couple of liters of TCP-contaminated water daily for several decades to run even a slight risk of getting cancer from it.

There is no federal drinking water regulation of TCP.  This means that if you live anywhere but California, you’ll probably never know if it’s in your water or not.
TCP has been called a “garbage chemical.” It was most likely added to fumigants not because it was needed but simply to get rid of it and avoid the cost of disposal. (It is widely believed that this is a strong motivation for putting the industrial waste product fluorosilicic acid commonly called “fluoride” into drinking water–just to get rid of it without the expense of toxic waste disposal.)

Tulare is getting four new water treatment tanks containing activated carbon and two new wells to be financed by litigation, still in progress, against Dow Chemical and the Shell Oil Company, the companies who provided TCE in the 1940s to be added to fumigants.

Several cities in California in addition to Tulare have sued the two companies, with Clovis reaching a $22 million settlement in 2016.

TCP is readily removed from water by granular activated carbon. This means that if you have a good quality home drinking water system–either a carbon filter or a reverse osmosis unit–you don’t have to worry about TCP.

Source Credit: The Fresno Bee.

Michigan, After the Flint Water Disaster, Is Adopting the Toughest Lead Rule in the Nation

In response to the Flint public water supply lead crisis that started in 2014 as a result ancient infrastructure and incredibly poor management, the state of Michigan is adopting a new lead standard for public water that is more stringent than the nation’s 15 ppb allowable.  In addition, it mandates a long-term project to replace the state’s ancient lead water piping system.

Under new standards set by the Michigan Department of Environmental Quality, the maximum level of allowable lead in drinking water will drop to 12 parts per billion in 2025. The federal level as mandated by the Environmental Protection Agency (EPA) is 15 parts per billion.

All public water systems are required to replace the state’s 500,000 lead service lines at a rate averaging 5 percent per year beginning in 2021 over a 20-year period.

The new rules prohibit partial lead service line replacement due to the potential for elevated lead levels that could harm public health. Most public water systems are required to perform a full system inventory detailing all parts and materials used.

“The new Michigan Lead and Copper Rule is the most stringent in the world when applied to cities with lead pipe – yet it strikes a reasonable balance between cost and benefit,” Virginia Tech professor Marc Edwards, a water engineer who first raised the issue of Flint’s lead contamination, said in an email to a Reuter’s researcher.

Source Credit: CompuServe News

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Dosatron Water-Driven Chemical Injection Pump


Dosatron has the only water powered chemical injector that is NSF/ANSI 61 & 372 Certified. The NSF-certified 14 gallon per minute Dosatron D14 unit is ideal for injection of water treatment chemicals like chlorine and hydrogen peroxide in residential applications.

Water-powered pumps offer several advantages. They are very easy to install, require no electricity, and feed the injected chemical proportionally, depending on the rate of flow through the pipe. This means they can be installed at any place in the water line without flow switches or the expensive metering equipment required with electric pumps installed after the well’s pressure tank.

The fully adjustable D14 Dosatron injects at a flow rate of 1:500 to 1:50. It is a compact pump that installs directly into the water line. As water runs to the point of use, the pump injects the water treatment chemical into the line.  It can be used to disinfect non-potable water or to pre-treat for iron, manganese, and hydrogen sulfide filters. The pump is so light that it can be supported by the pipe itself,  or it can be wall mounted (bracket is included)  and installed with hose connections.


Dosatron offers an easy way to add chlorine or hydrogen peroxide treatment. These units are durable and easy to service, and parts are readily available.

The D14WL2NAF is the NSF-certified, drinking water grade of Dosatron units. It should not be confused with Dosatron models intended for agricultural use that are sold on many websites.

More information from the manufacturer’s website.

New Proposition 65 Rule

Posted June 6th, 2018

California’s New Proposition 65

The Safe Drinking Water and Toxic Enforcement Act of 1986 (Proposition 65) requires businesses to provide warnings to consumers in California of products that cause cancer, birth defects, or harm to health.  These warnings have been visibly present in restaurants, for example, in CA but are so common they have become unnoticeable. Two years ago a task force got together to figure out a way to make consumers more aware of these warnings.

What is new to the law?

It’s simpler to understand:  On each warning sign there will be a yellow triangle with an exclamation point.  The wordage will change from “this products contains…” to “this product will expose you to…”, then, 1 or 2 chemicals will be listed.

A website will be provided for more information– www.p65warnings.ca.gov.

There are about 1,000 chemicals listed on Prop 65.

How will this affect vendors?

Sellers will be required to put Prop 65 warnings with new language on products that are subject to this law. Manufacturers have the primary responsibility for placing these warnings. Manufacturers can either label the product or provide notice to the retailer that the product may provide exposure to a listed chemical. They should also provide the warning materials.

Many water treatment products will not be affected by the law and don’t require the warning.

Information above is from a Webinar provided to members by the Water Quality Association.


Billions Of Gallons Of Water Saved By Thinning Forests

Too many trees in Sierra Nevada forests stress water supplies, scientists say



There are too many trees in Sierra Nevada forests, say scientists affiliated with the National Science Foundation (NSF) Southern Sierra Critical Zone Observatory (CZO).

That may come as a surprise to those who see dense, verdant forests as signs of a healthy environment. After all, green is good, right? Not necessarily. When it comes to the number of trees in California forests, bigger isn’t always better.

That’s in part because trees use lots of water to carry out basic biological tasks. In addition, they act as forest steam stacks, raking up water stored in the ground and expelling it as vapor into the atmosphere, where it’s accessible to humans and forest ecosystems only when it falls back to Earth as rain and snow.

That process — by which plants emit water through tiny pores in their leaves — is known as evapotranspiration. And according to researchers, excessive evapotranspiration may harm a fragile California water system, especially during prolonged, warm droughts.

New research published this week in the journal Ecohydrology shows that water loss from evapotranspiration has decreased significantly over the past three decades. That’s due in large part to wildfire-driven forest thinning — a finding with important implications for forest and water management.

A century of forest management had kept wildfires to a minimum. But without fire, Sierra forests grew very dense. In recent decades, new policies have allowed nature to take its course, with wildfires helping to thin out overgrown forests.

“Forest wildfires are often considered disasters,” said Richard Yuretich, director of NSF’s CZO program, which funded the research. “But fire is part of healthy forest ecosystems. By thinning out trees, fires can reduce water stress in forests and ease water shortages during droughts. And by reducing the water used by plants, more rainfall flows into rivers and accumulates in groundwater.”

Using data from CZO measurement towers and U.S. Geological Survey satellites, researchers found that over the period 1990 to 2008, fire-thinned forests saved 3.7 billion gallons of water annually in California’s Kings River Basin and a whopping 17 billion gallons of water annually in the American River Basin — water that would otherwise have been lost through evapotranspiration.

Forest thinning has increased in recent decades in an effort to stave off disastrous wildfires fueled by dense forests. This study shows that restoring forests through mechanical thinning or wildfire can also save California billions of gallons of water each year.

“The need for forest restoration is being driven largely by the need to lower the risk of high-intensity wildfires and restore forest health,” said University of California Merced scientist Roger Bales, director of the Southern Sierra CZO and study co-author. “Downstream users who benefit from the increased water yield are an important potential revenue stream that can help offset some of the costs of restoration.”

Forested areas needing restoration are large, Bales said, but potential changes in water availability are significant. The total effect of wildfires over a 20-year period suggests that forest thinning could increase water flow from Sierra Nevada watersheds by as much as 10 percent.

The U.S. Forest Service says that 6 to 8 of the 21-million acres it manages in California need immediate restoration. Another 58 million acres nationally also require restoration. For California alone, restoration costs are estimated at $5 to $10B. But, according to the study authors, the restoration might help pay for itself.

“We’ve known for some time that managed forest fires are the only way to restore the majority of overstocked western forests and reduce the risk of catastrophic fires,” said James Roche, a National Park Service hydrologist and lead author of the new study. “We can now add the potential benefit of increased water yield from these watersheds.”

About The National Science Foundation (NSF)

SOURCE: The National Science Foundation (NSF)

Reprinted from Water Online.

The CDC Recommends: Don’t Drink Pool Water


From 2000 to 2014, public health officials from 46 states and Puerto Rico reported 493 outbreaks associated with treated recreational water, resulting in more than 27,000 illnesses and eight deaths, according to a report in the May 18 Morbidity and Mortality Weekly Report. Hotel pools and hot tubs were the setting for about a third (32 percent) of the outbreaks, followed by public parks (23 percent), club/recreational facilities (14 percent) and water parks (11 percent).

Most of the infections were from three organisms that can survive chlorine and other commonly used disinfectants: Cryptosporidium, a parasite that can cause gastrointestinal problems, Pseudomonas, a bacteria that causes swimmer’s ear, and Legionella, a bacteria that causes a pneumonia-like illness.

So, what to do? The CDC recommends a few steps before diving in: Don’t swallow pool water. Don’t let children with diarrhea in the water. And use test strips to measure levels of pH, bromine and chlorine in the water. The cleaner the water, the safer to swim.


Source: Science News.

Summer Rains Increase Risk of Human Viruses in Groundwater


By Kelly A. Reynolds, MSPH, PhD

Gazette note: Below is a truncated version of an excellent article  from the June 2017 issue of  Water Conditioning & Purification.  Dr. Kelly A. Reynolds is a widely recognized authority on water quality issues and especially microbial contamination. The increasing frequency of waterborne disease described in the article explains the growing popularity of point of use and point of entry home treatments like ultraviolet disinfection. 


Just as the weather constantly varies, the quality of source water is also ever-changing. Increased rainfall in spring and summer months creates additional challenges to municipal water suppliers and private well owners as water moving over the land and through the soil accumulates added contaminants capable of causing human disease.


Heavy rainfall associated with waterborne disease


Surveys of extreme precipitation events indicate (rainfall more than two inches a day) and waterborne disease outbreaks (WBDO) in the US are strongly correlated. Retrospective comparison of 548 outbreaks documented by US EPA and precipitation data from the National Climatic Data Center from 1948 to 1994 showed that 68 percent of WBDOs were preceded by extreme precipitation events. Surface water was the most likely to be contaminated and result in an outbreak during the same month as the rainfall event but groundwater outbreaks lagged by about two months.


Twenty-four years ago in late March, the largest documented waterborne outbreak in US history occurred in Milwaukee, WI. Before identifying the problem, residents consumed contaminated water for over two weeks. Ultimately, more than 400,000 people were sickened with diarrhea and over 100 died. Cryptosporidium, a protozoan pathogen, caused the outbreak and may have been introduced due to increased precipitation and the presence of nearby cattle farms. Crypto has been found in 64 percent of manure samples from a sampling of 50 livestock farms. Following rain and land runoff, Crypto from nearby farms is readily transported to surface supplies, where associated increases in turbidity further tax treatment works.


Groundwater risks


Surface water risks are somewhat expected and municipalities have treatment tools, including the use of flocculants, filtration and disinfectants to settle out, filter and inactivate harmful microbes. While federal regulations mandate treatment of surface water, utilities accessing groundwater are not necessarily required to treat. Thus, less obvious and less controlled are groundwater contamination events. The greatest concern with seasonal groundwater contamination are human viruses. Viruses, unlike larger bacteria and protozoa, easily navigate the tortuous path from land surface to underground aquifers. Storms, however, can lead to sewer overflows and contamination of groundwater wells with a variety of microbial hazards.


Recently Minnesota and Wisconsin state health departments announced evidence of disease-causing microbes in a high percentage of drinking-water wells. In Minnesota, eight percent of a collection of 478 samples and 37 percent of the 82 public water systems with a groundwater well supply tested positive for human viruses. Eleven percent were positive for Salmonella bacteria. Less is known about household well water supplies. An estimated 34 million households in the US are served by private wells. One Wisconsin study found that out of 50 wells from seven hydrogeologic districts, eight percent were positive for human viruses, including hepatitis A virus, rotavirus, and noroviruses. With summer being Wisconsin’s rainy season, concern this time of year is especially heightened.


Most private and public groundwater supplies are not filtered or disinfected. The presence of low levels of human virus genomes in groundwater is common and has been associated with a 30 percent increase in gastrointestinal illness. Up to 63 percent of gastrointestinal illnesses in children were attributed to these tap-waterborne viruses.

Source: Water Conditioning and Purification.

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A Case Where Two Is More than Twice As Much as One

doublewholehouseFor a water filter to work well, the water needs an adequate “residence time” within the filter medium. The rate that water flows through the filter affects the filter’s effectiveness (the percentage of the contaminant it removes), the pressure drop (how much the filter reduces water pressure), the longevity of the filter medium, and, consequently, the cost of operation.

We’ve taken the manufacturer’s performance data on a single filter cartridge to illustrate the interesting fact that by doubling the capacity of a whole house filter, installing two identical filters side by side, you more than double the value. The illustration above shows a whole house filtration setup using standard-sized 4.5″ X 20″ filter cartridges.  The water passes through an initial sediment cartridge (sediment filters will handle much higher flow rates than equally- sized carbon filters) then the line splits to go through two carbon filters.  Each of the carbon filters, therefore, handles only half as much water, at half the flow rate, giving each cartridge double the residence time to do its work.

The cartridge in question is a top quality chloramine cartridge from Pentair. It is a unique radial flow carbon with a very low pressure drop and a high chloramine capacity. (It is also expensive, as cartridge prices go.) Note from the chart that as the flow rate is cut in half, the gallons-treated capacity more than doubles, and the pressure drop falls to less than half. And note, significantly, that the operating cost per gallon for the two filters installed in parallel is about 1/3 the cost of a single filter processing water at the same flow rate. (Costs are based on our current retail price for the cartridge, without considering volume discount, which makes using the double system even more economical.)


Format Pressure Drop Cartridge Life Removing Chloramine Operating Cost Per Gallon of Water Treated
Single Filter @ 5.0 GPM Service Flow 2.5 psi 10,000 gallons $0.0168  -1 2/3 cents per gallon.


Single Filter @ 2.5  GPM Service Flow


1 psi 25,000 gallons $0.0067 –2/3 cent per gallon.
Parallel Installation of 2 Filters @ 5 gpm Service Flow 1 psi 50,000 $0.0067 –2/3 cent per gallon.

The example given would serve a small family–2 or 3 people–living in a home with one or two bathrooms. The same proportions can be applied, however, to other types of treatment and other filter applications.The double filter setup also gives extra capacity should you needed it. Although the unit is sized for 5 gpm service use, it would easily accommodate a 10 gpm demand should the need arise.  A word of caution, however, concerning tank-style backwashing filters. When you increase the size of backwashing filter, you also increase its backwash water requirement, plus oversizing can actually hurt performance. Tank-style filters actually have a minimum flow rate that should be observed.


Pentek’s CRFC20-BB cartridge is a nominal 25 micron radial flow granular carbon cartridge that has minimal flow restriction. 10,000 gallons of chloramine reduction at 5 gpm; 25,000 gallons of chloramine reduction at 2.5 gpm; 200,000 gallons of chlorine reduction at 4 gpm. Pressure drop is only 2.5 psi at 5 gpm.

Flaw Found In Water Treatment Methods

 Gazette Introductory Note: It took us several decades after public water suppliers started using chlorine as a disinfectant to figure out that the disinfection process was creating a seemingly countless group of pretty nasty chemicals that we refer to collectively as “disinfection byproducts” and regulate as THMs. It should not surprise us, then, than when we apply hydrogen peroxide and UV light to eradicate water contaminants we create “presumably less harmful chemicals” that the article below refers to as “transformation products.” Nature is about change. We know that when we “remove” something from water we are often just changing it to something “presumably less harmful.”  Chlorine doesn’t go away: it becomes chloride. So who knows what phenols from personal care products might morph into when exposed to oxidation?

Public water quality has received a lot of attention in recently years as some disturbing discoveries have been made regarding lead levels in cities across the country. Now, a new study from the Johns Hopkins University pinpoints other chemicals in water that are worth paying attention to — and in fact, some of them may be created, ironically, during the water treatment process itself.

To rid water of compounds that are known to be toxic, water treatment plants now often use methods to oxidize them, turning them into other, presumably less harmful chemicals called “transformation products.” Though earlier studies have looked at the byproducts of water treatment processes like chlorination, not so much is known about the products formed during some of the newer processes, like oxidation with hydrogen peroxide and UV light, which are especially relevant in water reuse.

“Typically, we consider these transformation products to be less toxic, but our study shows that this might not always be the case,” says lead author Carsten Prasse assistant professor in the Department of Environmental Health and Engineering at the Johns Hopkins Whiting School of Engineering and the university’s Bloomberg School of Public Health. “Our results highlight that this is only half of the story and that transformation products might play a very important part when we think about the quality of the treated water.”

Prasse, along with colleagues from the University of California, Berkeley, chose to look at phenols, a class of organic chemicals that are among the most common in the water supply, as they’re present in everything from dyes to personal care products to pharmaceuticals to pesticides as well as in chemicals that are naturally occurring in water.

To determine what compounds the phenols transform into during treatment, the team, whose results are published in Proceedings of the National Academy of Sciences, first oxidized phenols using peroxide radicals, a process often used by water treatment plants. Next, they borrowed a clever method from biomedicine: They added amino acids and proteins to the mix. Depending on what chemical reactions took place, Prasse and his team could do some backwards calculation to determine what compounds the phenols must have turned into in the earlier step.

They discovered that the phenols converted into products including 2-butene-1,4-dial, a compound that is known to have negative effects, including DNA damage, on human cells. Interestingly, furan, a toxic compound in cigarette smoke and car exhaust, is also converted into 2-butene-1,4-dial in the body, and it may be this conversion that’s responsible for its toxicity.

To test the specific effects of 2-butene-1,4-dial on biological processes more fully, the team exposed the compound to mouse liver proteins. They found that it affected 37 different protein targets, which are involved in a range of biological processes, from energy metabolism to protein and steroid synthesis.

One enzyme that 2-butene-1,4-dial was shown to bind is critical in apoptosis, or “cell suicide.” Inhibiting this compound in a living organism might lead to unchecked cell proliferation, or cancer growth. And other compounds that 2-butene-1,4-dial interferes with play key roles in metabolism. “There are a lot of potential health outcomes, like obesity and diabetes,” says Prasse. “There’s a known connection between pesticide exposure and obesity, and studies like ours may help to explain why this is.”

The results are exciting since this is the first time these methods have been applied to water treatment, Prasse says. In time, they may be expanded to screen for other types of compounds beyond phenols.

Water purification is extraordinarily challenging, since contaminants come from so many different sources — bacteria, plants, agriculture, wastewater — and it’s not always clear what’s being generated in the process. “We’re very good at developing methods to remove chemicals” says Prasse. “Once the chemical is gone, the job — it would seem — is done, but in fact we don’t always know what removal of the chemical means: does it turn into something else? Is that transformation product harmful?”

Prasse and his team point out that by the year 2050, it’s been estimated two-thirds of the global population will live in areas that rely on drinking water that contains the runoff from farms and wastewater from cities and factories. So safe and effective purification methods will be even more critical in the coming years.

“The next steps are to investigate how this method can be applied to more complex samples and study other contaminants that are likely to result in the formation of similar reactive transformation products,” says Prasse. “Here we looked at phenols. But we use household products that contain some 80,000 different chemicals, and many of these end up in wastewater. We need to be able to screen for multiple chemicals at once. That’s the larger goal.”

Coauthors on the study were Breanna Ford and Daniel K. Nomura of the Department of Nutritional Sciences and Toxicology at the University of California, Berkeley. The senior author was David L. Sedlak of the Department of Civil and Environmental Engineering at the University of California, Berkeley.

This research was supported by the National Institute for Environmental Health Sciences Superfund Research Program (Grant P42 ES004705) at the University of California, Berkeley.

SOURCE: Johns Hopkins University

Source: Water Online.

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