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Which type of water filtration is best?

It is best to use a point-of-entry filter system (where your water pipe enters your house), or whole-house filter system, for VOCs because they provide safe water for bathing and cleaning, as well as for cooking and drinking. Activated carbon filters can remove some VOCs.

cdc.gov - Choosing Home Water Filters & Other Water Treatment Systems | Drinking ...

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Step 2: Think about why you’re considering a filter.

These are some common reasons that people choose to use water filters. Knowing what you need or want from your water treatment system is an important first step to choosing the right system for you.

“I don’t like the way my water tastes.”

You might be surprised to learn that the main function of popular refrigerator and pitcher filters is to improve the taste of your water, and most don’t fully protect against germs and many other contaminants. Some people do not like the taste of their tap water. Sometimes this is because of the disinfectant (like chlorine) that helps keep the water safe from germs. Sometimes minerals or other naturally occurring contaminants like sulfur-containing compounds that are not harmful change the taste of the water. Activated carbon filters (the type of filter found in many refrigerators and pitcher filters) can help reduce unpleasant tastes and odors. Reverse osmosis systems can also improve taste and also reduce the levels of common chemicals such as lead. Check the label to ensure that taste and odor (NSF 42) are addressed by the particular filter you are considering. Keep in mind that if you use a chlorine-removing whole-house filter, you might end up increasing the amount of germs that grow in your plumbing. Most harmful contaminants can’t be seen, smelled, or tasted. Some harmful contaminants, like volatile organic compounds (VOCs) that sometimes contaminate private wells, can give water a bad taste and might smell like gasoline or other chemicals. There are many different kinds of VOCs, and they have different health effects: Some cause cancer, irritate skin, affect mucous membranes, or damage the nervous system, liver, or kidneys. To identify the best filter, special testing may be needed to determine which VOCs are present in your water. It is best to use a point-of-entry filter system (where your water pipe enters your house), or whole-house filter system, for VOCs because they provide safe water for bathing and cleaning, as well as for cooking and drinking. Activated carbon filters can remove some VOCs. If you have a private well and notice a change in the taste of your water, consider having your well water tested. If you have a public water system and notice a change in the taste of your water, report this to your water company. Just keep in mind that the taste and smell (or lack thereof) of water is not necessarily an indication of how free it is from germs and chemicals.

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“I’m worried about lead in my water.”

Lead in drinking water can come from homes with lead service lines that connect the home to the main water line. Homes without lead service lines may still have brass or chrome-plated brass faucets, galvanized iron pipes or other plumbing soldered with lead. Lead can enter drinking water when a chemical reaction occurs in plumbing materials that contain lead. This is known as corrosion – dissolving or wearing away of metal from the pipes and fixtures. The best way to know your risk of exposure to lead in drinking water is to identify the potential sources of lead in your service line and household plumbing. Because no safe blood level has been identified for young children, all sources of lead exposure for children should be controlled or eliminated. EPA has set the maximum contaminant level goal for lead in drinking water at zero because lead can be harmful to human health even at low exposure levels. If you are concerned about lead in water or know that your plumbing contains lead, you can take action to reduce the amount of lead in your drinking water and minimize your potential for exposure. You can reduce or eliminate your exposure to lead in tap water by drinking or using only tap water that has been run through a “point-of-use” filter certified external icon by an independent testing organization to reduce or eliminate lead (NSF/ANSI standard 53 for lead removal and NSF/ANSI standard 42 for particulate removal). If you have a lead service line, use a filter for all water you use for drinking or cooking. by an independent testing organization to reduce or eliminate lead (NSF/ANSI standard 53 for lead removal and NSF/ANSI standard 42 for particulate removal). If you have a lead service line, use a filter for all water you use for drinking or cooking. You can flush your water to reduce potential exposure to lead from household lead plumbing. This is especially important when the water has been off and sitting in the pipes for more than 6 hours. Before drinking, flush your home’s pipes by running the tap, taking a shower, doing laundry, or doing a load of dishes. The amount of time to run the water will depend on whether your home has a lead service line or not, and the length of the lead service line. external icon Drink or cook only with water that comes out of the tap cold. Water that comes out of the tap warm or hot can have higher levels of lead. Boiling this water will not reduce the amount of lead in your water.

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“I have arsenic in my water.”

Arsenic is a heavy metal that is often found in ground water sources, including some private wells and some public water systems that use groundwater. Arsenic is associated with several health problems and can cause cancer. Arsenic can be present in two forms: trivalent and pentavalent. It is important to know what kind (or “species”) of arsenic is present in your water in order to select the best filter. If your water is treated with chlorine, you are more likely to have pentavalent arsenic, which can be removed by filters labeled with the NSF standard 53 or 58. If your water is not treated, additional treatment (a “pre-oxidation step”) might be needed to convert the trivalent arsenic to pentavalent arsenic before the water is filtered. Distillation is highly effective at removing arsenic, although this technology is not as practical for home use because it uses more energy and takes longer than other water treatments.

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“I have nitrates in my well water.”

Nitrates are chemicals that get into groundwater from contamination with fertilizer, manure, or septic systems, sewage, or erosion of natural deposits. Nitrates make it hard for your red blood cells to carry oxygen. This can be dangerous for infants and some adults. If you get your water from a public water system, nitrate levels are monitored and controlled. If you have a private well, you need to have your well water tested to find out if nitrates are a problem for you. If testing determines your water has high levels of nitrates, you can choose reverse osmosis (NSF 58) or distillation (NSF 62) technology. Boiling and filtration do not remove nitrates. If your water contains high levels of nitrates, other contaminants might also be present. Contact your local health department for recommendations about testing for other contaminants.

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“I have a weakened immune system.”

People who are immunocompromised, or have immune systems weakened by chemotherapy, AIDS, or organ transplants, should consult with their health care provider to determine whether they should consider installing a water treatment system to ensure their water has a low concentration of germs, especially the germ Cryptosporidium. Filters that have the words “reverse osmosis” on the label protect against Cryptosporidium, as do those with an “absolute 1 micron” pore size. You can also look for the standards NSF 53 or NSF 58 on the label.

Cryptosporidium is a special concern for people with compromised immune systems.

Filters designed to remove Crypto (any of the four messages below on a package label indicate that the filter should be able to remove Crypto):

Reverse osmosis (with or without NSF testing)

Absolute pore size of 1 micron or smaller (with or without NSF testing) pore size of 1 micron or smaller (with or without NSF testing) Tested and certified by NSF Standard 53 or NSF Standard 58 for cyst removal Tested and certified by NSF Standard 53 or NSF Standard 58 for cyst reduction

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Filters labeled only with these words may NOT be designed to remove Crypto:

Nominal pore size of 1 micron or smaller

One micron filter

Effective against Giardia

Effective against parasites

Carbon filter

Water purifier

EPA approved Caution: EPA does not approve or test filters

EPA does not approve or test filters EPA registered Caution: EPA does not register filters based on their ability to remove Cryptosporidium EPA does not register filters based on their ability to remove Cryptosporidium Activated carbon

Removes chlorine

Ultraviolet light

Pentiodide resins

Water softener

Chlorinated

In addition, immunocompromised people should not change water filters themselves, as this may expose them to the contaminants collected by the filter and potentially increase their risk of infection. Some filters can remove parasites such as Cryptosporidium and Giardia if used properly. However, they may not remove viruses and bacteria. Germs could still be present in your filtered water. “I’m planning a camping trip and plan to purify water from a stream, lake, or spring to drink.” There are a range of water treatment options that campers and travelers may consider if they anticipate having access to mainly untreated or poorly treated water sources. Boiling water is the most effective approach to killing all kinds of germs in water. Using an absolute 1-micron filter (1-micron sized holes or smaller) or a filter labeled as certified by NSF Standards 53 or 58 will remove parasites if used properly, but will not remove viruses or all bacteria. Check the label of your filter product. “I want to use my water for nasal rinsing, such as with a neti pot or as a religious practice.” If you are making a solution for irrigating, flushing, or rinsing your sinuses (for example, by using a neti pot, sinus rinse bottle, or other irrigation device), or putting water into the nose as part of a religious practice, use safe water to lower your risk of infection with Naegleria fowleri. This tiny ameba causes a rare infection by traveling up the nose to the brain and causing death. Take at least one of these actions to lower your risk of becoming infected: Boil: Use water that has been previously boiled for 1 minute and left to cool. At elevations above 6,500 feet, boil for 3 minutes. Use water that has been previously boiled for 1 minute and left to cool. Filter: Use a filter designed to remove some water-loving germs. The label may read “NSF 53” or “NSF 58.” Filter labels that read “absolute pore size of 1 micron or smaller” are also effective. Use a filter designed to remove some water-loving germs. Buy: Use water with a label specifying that it contains distilled or sterile water. Use water with a label specifying that it contains distilled or sterile water. Disinfect: Learn how to disinfect your water to ensure it is safe from Naegleria. Chlorine bleach used at the right level and time will work as a disinfectant against this germ. Learn how to disinfect your water to ensure it is safe from Naegleria.

“I have hard water.”

Hard water, or water that contains excessive amounts of minerals like calcium and magnesium, can leave a scaly residue and prevent soaps from lathering. Water softeners can be used to treat this problem. Water softeners use ion exchange technology, so they are technically not filters and do not protect you from germs in the water. Water softeners also remove beneficial minerals from the water.

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cdc.gov - Choosing Home Water Filters & Other Water Treatment Systems | Drinking ...

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