Whole House Water Treatment: Keeping It Simple and Easy

Simple whole house treatment for city water consists of a sediment filter, a carbon filter, and a TAC scale prevention unit. 

One of the best-kept secrets about water treatment equipment is that to be effective it does not have to be complicated, expensive, and large. The truth is that much of the innovative energy of water treatment professionals in recent years has been directed toward greatly improved performance of traditional items like filter cartridges and toward the development of technologies that provide simpler solutions to problems like scale prevention.

Filter cartridges for city water applications, because of improved efficiency, often outperform large tank-style systems. Similarly, recently developed alternatives to conventional water softeners, like TAC units, can greatly improve water quality and prevent scale buildup without complicated control programming, drain connections, salt purchases, or service agreements.

It is easy to be impressed by the size of a large tank-style whole house carbon filter and to assume that because it is big it works better than a filter that is relatively small. Looks can be deceiving. Compact filter cartridges, made from very tightly packed powdered filter carbon, actually follow a different set of rules than large filters.  Concepts like “empty bed contact time” used to design and to size tank style filters filled with granular carbon do not apply to modern filter cartridges.  In many ways a well- engineered 4.5″ X 20″ carbon block filter cartridge can outperform a carbon tank with several cubic feet of granular carbon.

Here are some advantages of cartridge-style whole house filters as compared with large tank-style backwashing units:

Easy to install. No drain or electrical connection needed. Thus, fewer plumbing connections, no wiring, and greater flexibility in choosing a place to install.

Low purchase price. Typically, a cartridge filter array costs less than 1/2 as much as a tank-style equivalent.

Easy to service. With cartridge units there is little that can go wrong, so an easy cartridge change and an occasional o ring replacement are all that’s needed. Changing a cartridge is a much easier “do it yourself” job than rebedding a tank-style filter.

Versatile. There are many cartridges to choose from.  When you put in a new cartridge, you have a new water filter. If your city changes its disinfectant from chlorine to chloramine, you just change your filter cartridge. If you have a standard-sized filter housing, which is what we recommend, you have literally dozens of cartridges to choose from.

Perhaps the greatest mark of versatility is the ability to easily increase filter capacity by installing two or more carbon filters in parallel, so that each cartridge gets a fraction of the service water.  If your cartridge supports a service flow of six gallons per minute, installing a second in parallel gives you twelve per minute.  The extra carbon unit(s) can be added at the time of the initial installation, or later, to accommodate an increase in family size or other expanded need for filtered water.

Two carbon cartridges in parallel double the capacity and greatly reduce pressure drop. The multi-cartridge system provides higher flow rates for larger homes.

For scale prevention, passive TAC systems are becoming a popular substitute for conventional water softeners.  TAC units require no drain connection and no electricity. The only upkeep is an easy media change, recommended for every three years.

The products featured on this page do not require electricity, drain connections, chemicals, or even water for regeneration. There are no electronic controls to program, no manuals to study, no salt to buy, no brine tanks to clean. Annual filter service is so easy most homeowners can do it themselves. Even the media change in the TAC tank (recommended every 3 years) does not require special equipment or great technical know-how.

More information about cartridge-style whole house units and salt-free scale treatment:

Brine from Desalination Can Be Put to Use

Currently, the world produces more than 100 billion liters (about 27 billion gallons) a day of water from desalination, which leaves a similar volume of concentrated brine. Much of the brine is pumped back out to sea, and current regulations require costly outfall systems to ensure adequate dilution of the salts to prevent damage to marine ecosystems.

A new MIT study shows that through a fairly simple process the waste material can be converted into useful chemicals — including ones that can make the desalination process itself more efficient.

The approach can be used to produce sodium hydroxide, among other products. Otherwise known as caustic soda, sodium hydroxide can be used to pretreat seawater going into the desalination plant. This changes the acidity of the water, which helps to prevent fouling of the membranes used to filter out the salty water — a major cause of interruptions and failures in typical reverse osmosis desalination plants.

Another important chemical used by desalination plants and many other industrial processes is hydrochloric acid, which can also easily be made on site from the waste brine using established chemical processing methods. The chemical can be used for cleaning parts of the desalination plant, but is also widely used in chemical production and as a source of hydrogen.

Converting the brine can thus be both economically and ecologically beneficial, especially as desalination continues to grow rapidly around the world. Environmentally safe discharge of brine is manageable with current technology, but it’s much better to recover resources from the brine and reduce the amount of brine released.

Adapted from MIT News.

Widespread PFAS Contamination Around Georgia Military Bases

The Military Times reports widespread PFAS contamination of water in the area of Gerogia military bases as the result of years of use of firefighting foam. Nationwide, the Air Force has acknowledged contaminating drinking water in communities close to its bases in more than a dozen other states.

In Georgia, Dobbins Air Reserve Base in Cobb County, Robins Air Force Base in Houston County and Moody Air Force Base in Lowndes County used the firefighting foam in training exercises and to put out fires when planes crashed. The foam also sometimes leaked out of its storage tanks, the Journal-Constitution reported. Thousands of gallons of foam soaked into the ground or washed into creeks and wetlands, killing fish and imperiling those who use the affected waterways for fishing, swimming and boating, the newspaper reported.

The contamination, which is linked to a class of chemicals known collectively as per- and polyfluoroalkyl substances, or PFAS, was laid out in a series of site inspection reports completed by the Air Force last year.

Of particular interest in this context is the EPA’s recent decision to not establish regulatory limits on PFAS. This ruling allows the military to disclaim responsibilty for contamination of drinking water in the areas surrounding bases. In a statement, the Air Force said its response is constrained by a lack of regulation for PFAS chemicals. The two that are the focus of most testing are known as PFOS and PFOA.

“Because PFOS/PFOA are unregulated and Georgia or federal entities have not established standards for non-drinking water sources, we cannot expend government resources on those water sources,” the Air Force said.

Reference: Military Times

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Filter Arrangement Using Compact Whole House Cartridge Filters

Compact whole house filters using 4.5″x 20″ cartridges in standard “Big Blue” housings or the equivalent can be arranged to effectively support very high service flow rates with parallel installation.

Figure 1.

For a single sediment filter, carbon filter, or specialty filter

Figure 2. 

For a sediment filter followed by a carbon or specialty filter. 

Figure 3.

For two carbon or specialty filters, each gets half the service flow.

Figure 4.

For a single sediment filter followed by parallel carbon or specialty filters.

Figure 5.

For a sediment filter followed by 3 carbon or media filters installed in parallel.

Figure 6.

Bypass. Either a single filter or an entire array can be isolated with a 3-valve bypass.

Leading Water Issues, Old and New

by Emily McBroom and Gene Franks

The statement,”my parents drank this water for 50 years, and it never hurt them” is no longer a valid excuse for consumers to not be concerned with their water quality.—Greg Reyneke.

In an article in H2O Quality magazine, water treatment expert Greg Reyneke (see note below) commented on recent information that has surfaced about some old water treatment issues. Below are Greg’s comments, followed by some observations of our own which suggest practical approaches to dealing with the contaminants. Greg’s comments are italicized.

Arsenic

A 2010 assessment by the Environmental Integrity Project suggests that the risk of getting cancer from drinking water containing 10 ppb of arsenic is closer to 1 in 136, almost 15 times higher than current EPA assumptions (1 in 2000). Many scientists say the increased risk of cancer in humans who drink water, inhale dust, or ingest soil contaminated with high levels of inorganic arsenic puts the chemical’s danger level in the same category as that of smoking cigarettes.

The acceptable maximum level for arsenic in drinking water, as recommended by the EPA, is just 1/5 what it was a few years ago. Removing arsenic from a small amount of drinking water is fairly easy, while point-of-entry removal is difficult and expensive. Since arsenic is mainly an ingestion issue, we recommend removing it from drinking water and practicing common sense avoidance for other water in the home. In other words, drink water from your kitchen reverse osmosis (RO) unit, not from the bathroom sink.  The best drinking water treatment for arsenic is reverse osmosis. Undersink filters with iron oxide media are also effective. Whole house arsenic treatment is possible but expensive and requires considerable upkeep.

Bacteria and Waterborne Pathogens

Chlorine and Chloramine

Nitrates

Conclusion

Of the issues discussed, whole house treatments are practical for bacteria and hardness. For city water with chlorine, chloramine, and general chemical issues, including PFAS, an appropriately designed and sized whole house carbon filter is recommended. For drinking water issues like lead, nitrates, and arsenic, an undersink reverse osmosis unit is the treatment of choice. A good undersink RO unit covers virtually all drinking water issues. It includes carbon block filters for chemical reduction and a very tight membrane that strains out lead, arsenic, fluoride, nitrates, sodium, and other undesirables.

Fatbergs and Bacteria

In September 2017, sewer workers in London discovered a “fatberg” made of oil and grease poured down London drains mixed with flushed wet wipes, diapers, and condoms that failed to disintegrate. This fatberg weighed in at 130 tons, the weight of about 19 African elephants, and stretched 820 feet, almost the total length of the London Bridge. Though it was cleaned out by the heroic efforts of sewer workers, a bit of the monster fatberg remains and can be seen at the Museum of London.

Fatbergs,  at the same time disgusting and somewhat comical,  give us an insight into the alien world of the sewer networks that keep towns and cities running smoothly. Fatbergs are pretty spectacular. They can shut down an entire municipal drainage system and they can cost millions of dollars to clear.

The famous fatberg pictured above is from London, but fatbergs exist everywhere, and not just in big cities.  The English seaside town of Sidmouth recently discovered a fatberg of gigantic proportions.

Fatburgs come at a big cost. Every year the UK spends an estimated £100,000,000 clearing away some 300,000 fatbergs created by congealed fats and waste that people pour down the sink and flush down the toilet. In addition to fats, diapers, so-called “disposable” wipes, and condoms are big contributors to fatberg formation.

Historically, water companies have resorted to the hard task of physical removal to keep drains clean. Cleaning away a fatberg often requires truly heroic efforts on the part of water treatment workers,

Bacteria to the rescue

A German company, however, has taken a new approach to the removal and prevention of fatbergs. A product called Lipasan, made in south-west Germany, treats fatbergs with a micro-organism solution made with bacteria grown specifically to eat fat.  Lipasan digests fat, grease, and oil.

Lipasan is being used with great success in the German city of Ramstein which has a particular problem with fatberg formation, because, according to a company spokesperson, “the city has a US Military base, which has brought with it a cuisine that is traditionally higher in fat.” Military bases are infamous in the US for contaminating their surrounding areas with water polluting chemicals. Currently PFAS has drawn most attention for military water pollution, but everything from trichloroethylene to benzene to mercury have been found in abundance in waters in the neighborhoods of military bases such as Camp Lejeune, NC. Perhaps fatbergs can be added to the list of the side effects of the military.

According to Dr. Andrea Junker-Buchheit, a lead scientist in the creation of Lipasan, “We treat fatbergs with a special micro-organism solution. We grow bacteria which have been developed specifically to eat fat. They digest all the fat, all the grease, all the oil.” The bacteria eats fat, and needs more and more of it to survive and grow.

The application of Lipasan consists of the use of dosing pumps to inject specific amounts of the bacterial solution into the pipes of the water treatment plant. The injected bacteria keep the pipes clean and fatbergs under control. Although preventive treatment with fat-gobbling bacteria is not cheap,  the cost is only a fraction of that of clearing fatbergs from pipes using conventional means.

Reference: BBC.

More about fatbergs from the Pure Water Gazette.

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Research casts doubt on EPA drinking water standard

by Justine Calma

More than 5 million Americans get their drinking water from public water systems that could contain hazardous levels of a chemical called nitrate, which is linked to public health risks — including cancer and birth defects. And the concentrations found in the vast majority of that drinking water would be deemed safe by the Environmental Protection Agency, according to a study published this month in the journal Environmental Health.

Nitrate occurs naturally in soil, water, and food. But when it is ingested, it can react with organic compounds in the body to form carcinogens.

A team of researchers at environmental health advocacy groups looked into nearly 40,000 public water systems that between 2010 and 2014 served 70 percent of Americans. They found that more than 1,600 of the systems they reviewed had average nitrate concentrations of at least 5 parts per million.

While that amount is just one-half of the level that the Environmental Protection Agency deems safe to drink, the lead study author told Grist that there is evidence that the federal standards may be outdated.

“The EPA is very slow in updating drinking water standards,” said lead author Laurel Schaider, a research scientist at the Silent Spring Institute, a non-profit research group in Massachusetts that studies the effects of chemicals on women’s health. In fact, just this week, Politico reported that the EPA won’t place federal limits on two chemicals associated with cancer and other health issues in drinking water — despite lawmakers on both sides of the aisle pressuring Andrew Wheeler, the agency’s acting administrator, to take action.

The EPA established 10 parts per million as its regulatory standard for nitrate in 1991 primarily to protect infants from “blue baby syndrome.” The syndrome, which can impact infants who are fed formula mixed with nitrate-contaminated water, causes a drop in in the amount of hemoglobin in the blood, which cuts the babies’ oxygen intake.

It’s unclear whether the EPA is considering revising its safety standard. In a December 2016 review of drinking water standards, it designated nitrate as “not appropriate for review at this time.” But in September 2017, the agency released a draft plan to reassess the health effects of nitrate, noting that health studies published since 1991 had called into question whether the EPA’s current maximum nitrate contaminant levels “provide adequate health protection for the general population.” The EPA declined to provide a comment to Grist.

Several studies have documented increased health risks — ranging from colorectal cancer, thyroid disease, and birth defects affecting the brain, spine, or spinal cord — stemming from elevated nitrate levels, even at concentrations below current federal regulatory limits. For example, a 2013 study of more than 4,000 mothers found that women who consumed water with levels well below the EPA limit were roughly twice as likely to deliver babies with birth defects. And a 2010 study of more than 21,000 women in Iowa documented an increased risk of thyroid cancer for people exposed to nitrate levels in public water supplies that were greater than 5 ppm for five or more years.

Although 99 percent of water systems surveyed in the Silent Spring Institute’s analysis showed nitrate levels below the EPA’s 10-ppm standard, 129 community water systems serving 144,000 Americans had an average nitrate concentration surpassing that upper limit. Private drinking wells weren’t included in this study, but are often located in rural and agricultural areas, where that study shows there tends to be more nitrates that can seep into the groundwater.

The biggest culprit for nitrate contamination is runoff from fertilizers or manure. That could point to why states in the West and Midwest, home to eight of the top 10 agriculture-producing states, had higher levels. The increased use of fertilizers, more prominent fossil-fuel combustion, and the growing popularity of nitrogen-fixing crops like soybeans have led to a doubling of the natural rate at which nitrogen is deposited into land since the 1920s.

Schaider’s team also found that water systems that served populations with a larger proportion of Hispanic people tended to have higher levels of nitrates. The researchers hypothesized that the correlation was due to the group’s association with agricultural work. But Hispanic residents didn’t appear to have high exposure to nitrates in the Midwest, suggesting a different explanation for the community’s outsized link to nitrates in their water.

Mary Ward, a senior investigator at the Occupational and Environmental Epidemiology Branch at the National Cancer Institute and a leading expert on nitrates, lauded the new research, which relied on publicly available data collected by EPA under the Safe Drinking Water Act, as the first assessment of the U.S. population’s potential exposure to nitrates through their public tap water.

Since most health studies on nitrate to date have focused on populations using public water supplies, a majority of the findings are for exposures below the EPA’s maximum contaminant level, said Ward. After all, public water utilities are mandated to provide drinking water that meets EPA safe-drinking standards.

Ward adds a note of caution when it comes to raising the alarm on nitrate levels below that current standard: “We need additional studies,” she wrote to Grist in an email. “The number of well-designed studies of these health outcomes are still too few to draw firm conclusions about risk.”

The study authors write that the issue merits further study, since nitrate has also been found to occur alongside other pollutants present in drinking water, including arsenic, pesticides, and other chemicals used to filter water. Robust monitoring of nitrate, the say, could be one way to improve water quality overall.

Article Source: Grist.

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Instructional Videos from Pentair Water University: Fleck 5600 & 2510 Valves

Fleck 5600

Fleck 5600 Control Valve Tear Down: https://youtu.be/BeD7IdE0FB8

Uses:

• Troubleshooting parts on the 5600 mechanical and SXT valves.
• Determining what color and size replacement parts you need for your specific valve type.
• Determining where replacement parts go.
• This video covers replacement of seals and spacers and piston, plus the examination and/or replacement of the brine valve (softeners only), the injector assembly (softeners only), and drain line flow control. The instructional video is done with a mechanical meter softener valve (Econominder) but can be generalized to any 5600 control.

Special Notes: Seals and spacer replacement using the stuffer tool begins at 7:00 minutes. The job is often done without the use of the stuffer tool.

Fleck 5600 Air in Brine System: https://youtu.be/c923S1j-Zbc

Use to check for air entering a brine system and check for damaged fittings or hose:

• When there is low to no salt usage by softener,
• The service water is “hard”,
• There are visible leaks, or
• Experiencing water hammering, or hydraulic shock, during regeneration
•  This video covers the connections and tubing in the brine draw system from the valve body to the air check in the brine tank. A Fleck 5810 is used in the demo, but all other Fleck controls work exactly the same.

Fleck 5600 Brine Valve Repair and Replacement: https://youtu.be/MiJktBgvi38

Use when:

• There is salty service water,
• The brine tank is overfilling, or
• There is excessive salt use
• This video covers inspection and/or replacement of the brine valve. The 5600 mechanical meter softener valve (Econominder) is used in the demo, but it can be generalized to other Fleck controls.

Fleck 5600 Injector Repairs: https://youtu.be/Rq3JR0FNkwE

Clean or replace a clogged injector or screen when:

• The brine tank is overfilling,
• No soft water to home, or
• There is salty service water

Fleck 5600 Drain Hose: https://youtu.be/M2vt85Bb6Yk

Diagnose and clear an obstructed drain hose when:

• The pressure drops in the home,
• There is salty service water, or
• There is slow to no drain flow during service regeneration

Fleck 5600 Meter Repairs: https://youtu.be/NWjjC__66xc

Meter not registering flow when there is:

• No regeneration
• No salt use
• No capacity decline on the control, or
• No flow indicator on the display

Depressurize Fleck 5600 Valve: https://youtu.be/iYHXHVD5ik8

Depressurize a system before completing any service work.

Set Time on Fleck 5600 Controller: https://youtu.be/NTp-Qm4j9y0

Use when the:

• Regeneration cycle occurs at the wrong time
• Display shows the wrong time

____________________________________________________________________________

Fleck 2510

Fleck 2510 Control Valve Tear Down: https://youtu.be/9kGhqrbt_R0

Uses:

• Troubleshooting parts on the 5600 mechanical and SXT valves
• Determining what color and size replacement parts you need for your specific valve type
• Determining where replacement parts go

Seals and spacers replacement begins at 9:20 on the video.

Fleck 2510 Air in Brine System: https://youtu.be/wY9oSSCD9E4

Use when air might be the brine system due to:

• Low to no salt usage
• Hard service water
• Visible leaks, or
• Water hammering during a regeneration

Fleck 2510 Brine Valve Repair and Replacement: https://youtu.be/x3Zp_OR5f6M

Use when:

• There is salty service water,
• The brine tank is overfilling, or
• There is excessive salt use

Fleck 2510 Injector Repair: https://youtu.be/Cbfp2cEKx_c

Clean or replace a clogged injector or screen when:

• Water overfills the brine tank
• There is no soft water, or
• There is salty service water

Fleck 2510 Drain Hose: https://youtu.be/1B6Gj2xHrkw

Diagnose and clear an obstructed drain hose when:

• Pressure drops in the home
• Service water is salty, or
• There is slow to no drain flow during regeneration

Fleck 2510 Meter Repairs: https://youtu.be/rD-2acNxW4Y

Use when there is:

• No regeneration
• No salt use
• No capacity decline on the control, or
• No flow indicator on the display

Depressurize Fleck 2510 System: https://youtu.be/9I8UYps_tSA

Depressurize a system before completing any service work.

How the Government Shutdown of 2019 Is Affecting the EPA

The US government shutdown has stymied environmental testing and inspections, prompting warnings that Americans’ health is being put at increasing risk as the shutdown drags on.

More than 13,000 employees at the Environmental Protection Agency (EPA) are not at work, with just 794 people deemed essential staff currently undertaking the agency’s duties.

The remaining skeleton staff are able to “respond to emergencies involving the safety of human life or the protection of property”, according to an EPA planning document. But many routine activities such as checks on regulated businesses, clean-ups of toxic superfund sites and the pursuit of criminal polluters have been paused since 28 December.

“State programs aren’t being funded, enforcement actions have stopped – it’s a nightmare,” said Gary Morton, president of AFGE Council 238, which represents about 9,000 EPA workers.

“EPA employees want to get back to work, they have bills and mortgages to pay. These are dedicated public servants who took an oath to serve and protect the American people. The states and community groups can’t do this work on their own.”

In some instances, state officials will be able to continue EPA-aligned tasks, such as deal with hundreds of former industrial facilities and other polluted areas known as superfund sites. An EPA spokeswoman said the agency will “continue to respond at sites where there is an imminent threat to the safety of human life” but that superfund cleanups have halted.

A senior EPA employee, who has been sidelined from work, said it will take weeks for the agency to catch up with its core functions once the shutdown is over.

“You’re just keeping the patient alive right now,” the staffer, who asked not to be named, said. Some staff, already disgruntled at the Trump administration’s rollbacks of environmental protections, are preparing to march in protest to the White House on Thursday, with working colleagues urged to call in sick.

The situation at the EPA means “communities across the country are forced to stand by while water and soil go untested, air is fouled, science is suspended, and looming threats from climate change grow more perilous,” said Elgie Holstein, a senior director at the Environmental Defense Fund.

“The shutdown serves as another reminder of the vital, underappreciated role that EPA and public health and environmental agencies play in keeping Americans out of harm’s way. An extended shutdown only increases the risks to the American people.”

The shutdown, sparked after Trump was unable to secure funds for a border wall with Mexico, has had a sweeping impact across government agencies that deal with the environment.

Forecasters at the National Hurricane Center in Miami have suspended work on predicting the next storm season, in the wake of a punishing series of hurricanes in 2018. National parks have been left unstaffed but open, leading to mountains of rubbish and several deaths.

Work to push ahead the Trump administration’s goal of opening up more land and water to fossil fuel extraction largely continues, however. The interior department is still handing out permits for oil drilling on federal land and the Gulf of Mexico, as well as pushing ahead with plans to drill in the Alaskan Arctic.

“While he’s closed the government to the American people, Trump has hung up an ‘open for business’ sign for corporate polluters,” said Melinda Pierce, legislative director of the Sierra Club.

Reprinted from the Guardian.