Water Filters FAQs:

fluoride water filters, countertop and under-counter


Frequently Asked Questions

About Our Water Filters

Note: You should always run your water for 20 to 30 seconds or more before filling your glass. This will remove any stagnant water that is sitting in your filters and improve the taste.

Water Filter Questions - FAQs  Frequently Asked and Answered

1.  How often do I have to check my KDF/GAC filter for chlorine using the chlorine test strips.

a.  If you are filtering city water, check for chlorine if the filtered water has a chlorine smell or taste.  For municipal water, the KDF/GAC filter can be used up to 3 years.

2. Can you use the Model CT or CTD-C for filtering well water?

a.  Yes, you can filter well water with the KDF/GAC filter, and it is recommended that you use the Model CTD-C which has a ceramic pre-filter.  You should replace the KDF/GAC filter once a year if you live in a farming community where pesticides are used.

3.  What is the flow rate of the countertop and under-counter filter systems.

a.  The flow rate is 1 gallon per minute for the KDF/GAC cartridge in a single housing system.  If you have a 2 or 3 housing system the flow rate can be as low as 1/2 gallon per minute. Dual or triple systems with our 1/2 micron or 1 micron carbon block cartridges will have a slower flow rate.  Fluoride removal systems using our activated alumina cartridge require a flow rate of 1/2 gallon a minute or less to remove the fluoride.

4.  What happens if water output slows down.

a.  If you're using the CTD-C or UCD-C filters, the ceramic pre-filter is beginning to get blocked with sediment.   The ceramic filter should be removed and soaked in warm water to loosen the sediment. Then the filter should be cleaned using a 3M Scotchbrite brand (or similar pad), available at any grocery store.  Important: To prevent difficulty opening the housing, do not over tighten the sump when re-installing the filter.  Tighten just enough to be snug.  Only tighten further if it leaks from the housing when running.  However, once tightened, check and make sure the filter does not move in the housing. If you hear it moving, you must tighten further.

5. Can the KDF/GAC filter get clogged?

a. The KDF/GAC filter may clog if there is too much sediment in your water.  It is suggested that you add a ceramic or sediment pre-filter to prevent that.  If it does clog, you can try to reverse the water connections to back-wash the cartridge.

6. When mounting the under-counter water filter faucet in my sink or countertop, what size is required for the faucet to fit.

a.  The faucet requires a 1/2" diameter hole for mounting.

7.  How do I replace the KDF/GAC filter when it stops removing chlorine?

a.  Remove the filter housing using the wrench supplied with your water filter system.  The housing has two parts: the cap with the metal fittings, and the longer half, called the sump, that screws into the cap.  Place the wrench over the narrow end of the sump housing and move towards the wider end until it stops.  Turn the sump counterclockwise to remove, keeping it over a sink or pail to catch the water.  Remove the old cartridge and slide the replacement cartridge into the sump part of the housing with the gold end down (it will only fit one way).  Place the base of the housing on the sump and tighten (clockwise) completely to prevent leaking. Important: To prevent difficulty opening the housing, do not over tighten the sump when re-installing the filter.  Tighten just enough to be snug.  Only tighten further if it leaks from the housing when running.

8.  Who makes your filters?

a. We purchase the components from industry-leading suppliers like Watts Water Quality Products, John Guest, Pentek (Ametek), G.A. Murdock, GE Osmonics, etc., and assemble our water filters that use the KDF 55 Process Medium from KDF Fluid Treatment.  The filters are 9 3/4" length by 2 1/2" to 2 3/4" width and fit in standard plastic housings.  Our KDF/GAC cartridges are American made in California and the ceramic cartridges are the Doulton brand made by Fairey Industrial Ceramics in the UK.

9.  Do you have a filter that removes the fluoride that is added to municipal water systems?

a. Yes, a special fluoride removal filter is required to remove fluoride.  For a municipal water system, the filter has an average life of one year and will remove 80 to 90 percent of the fluoride.  A combination filter using a double under-counter or double countertop configuration with our KDF/GAC filter is available.

10.  I have a bacteria problem in my drinking water.  What product should I use to remove bacteria?

a.  The ceramic filter is used to remove bacteria and cysts.  Use the Model UCD-C, a double under-counter filter with one ceramic cartridge as a pre-filter and the KDF/GAC cartridge as the second filter.  The countertop version of this filter is our Model CTD-C.  It connects to your faucet with a diverter.

11.  Why do you connect the ceramic filter first and then the KDF/GAC filter next in a double water filter system?

a.  The ceramic filter (Doulton Sterasyl 0.9 micron) should be in first housing to help extend the life of the KDF/GAC filter in the second housing.

12.  Can I use bleach to clean the ceramic filter?

a.  No.   Don't use bleach to clean the ceramic filter.  Soak it in water with one or two drops of dish washing soap and then scrub with a soapless dish cleaning pad.  The 3M Scotchbrite brand (or similar pad), available at any grocery store, works well.  Scrub in one direction with enough pessure to remove some of the ceramic material (made from unfired pottery). Then rinse in cold water.

13.  How often can you clean the ceramic filter before it wears out?

a.  Each time you clean the ceramic cartridge, a small amount is warn away.  The filter can be cleaned up to 40 times before it wears out (about once a month).

14.  Does the KDF filter remove chloramines?

a.  Yes, the KDF/GAC filter does remove some chloramines, but it does not remove all the chloramines (which is made up of chlorine and ammonia).  We have a special cartridge using catalytic carbon GAC designed to reduce chloramines.

15. Many of the filters I've seen use a carbon block filter.   What is the difference between your KDF/GAC filters and the carbon block filters?

a.  The KDF/GAC filter lasts longer and inhibits bacteria growth.  The carbon block filter alone allows bacteria to grow, and must be replaced more frequently.

16.  After connecting the diverter to my faucet from my countertop filter, water is leaking from the connection.  How to I solve the problem?

a.  Water can leak from the top of the diverter if you forget to put the black washer into the diverter before you connect it to your faucet (after you've removed the aerator).  A black washer is supplied with all countertop filters. You should also use Teflon tape on the threads before installing the diverter if you still have a leak.

17.  What is the flow rate of the Portable KDF/GAC Filter, Model CT-P?

a.  The Model CT-P has a flow rate of 0.5 gallons per minute.

18.  What is the flow rate of the Portable KDF/GAC Floride Countertop Filter Model CT-P-F?

a.  0.5 gallons per minute or slower.

19.  Are your water filter housings safe?

a.  Yes, our filter housings are made from high quality FDA grade polypropylene, similar to those from major manufacturers like Pentek (Ametek), approved safe to use for drinking water.  In fact, all our components meet the ANSI/NSF-Standard 61 and are safe for use in drinking water filters.

20.  How will I know when it's time to replace the KDF/GAC cartridge?

a.  Chlorine test strips are included to check your filtered water for chlorine.   I would recommend testing for chlorine after 2 1/2 or  3 years, or if you smell chlorine.   The filters can work up to 3 years without the need for a replacement, however, we suggest replacing the filters after 2 years, but no later than 3..

21.  Is the carbon in your KDF/GAC filter susceptible to channeling?

a.  No, the carbon granules in our KDF/GAC filter are compressed, and are less susceptible to channeling, or allowing water to bypass the filter medium.

22.  If I add a fluoride filter to a double countertop system or double under-counter system with a ceramic pre-filter, what is the sequence of the filters.

a.  The first filter, from the water supply, is the fluoride removal cartridge, next is the ceramic cartridge and the KDF/GAC filter is last. In areas where sediment is a problem in the water supply, the order from the water source would be ceramic, fluoride and then KDF/GAC.

23.  Will your KDF/GAC filter solve my hard water problem, which is also causing my water to taste bitter?

a.  No, the KDF/GAC filter will not solve a hard water problem or improve the taste attributed to hard water with total dissolved solids (TDS) above 250 or 300.   Hard water is caused by high levels of minerals, and the KDF/GAC cartridge leaves the minerals in the water, but removes the harmful chemicals and heavy metals.  A reverse osmosis system can be used to improve the water taste caused by hard water.

24.  Will the KDF/GAC filter cartridge remove iron in my water?

a.  Our KDF/GAC filter is made with KDF-55 (55 percent copper and 45 percent zinc), designed to remove chlorine from municipal water where low levels of iron may be present.  High levels of iron can clog the filter and limit its life.  A ceramic or sediment pre-filter should be used to filter out the iron to extend the life of the KDF/GAC cartridge. KDF-85 is designed to remove iron, usually present in well water. KDF-85 is made up of 85 percent copper and 15 percent zinc.

25.  My water has been tested, and bacteria was found.  What method should I use to remove the bacteria?

a.  There are a few ways to remove bacteria.  A point-of-entry UV purifier will kill bacteria in the water.  You may also use the Doulton ceramic pre-filter along with a KDF/GAC filter.

26.  How many parts per million chlorine will your KDF/GAC cartridge (Filter KG) remove before needing replacement.

a.  The KDF/GAC filter KG will remove approximately 60,000 parts per million chlorine.

27.  What cartridge would I use to remove MTBE, the gasoline additive?

a.  The KDF/GAC filter KG will remove MTBE.  The EPA recommends GAC as the best available technology for MTBE removal.

28.  Does your KDF/GAC filter warranty cover sediment clogging.

a.  No, our warranty does not cover sediment clogging.  If your municipal water contains a high level of sediment, you should add a sediment pre-filter (or ceramic pre-filter) to your under-counter or countertop KDF/GAC system to protect it from clogging.  New York City area water is known to have this problem.

29.  Are any of your filter systems recommended by medical professionals?

a.  Yes, our double countertop and double under-counter filters using KDF and carbon block cartridges have been recommended by Dr. Andrew Weil (a well-known author and Harvard Medical School graduate based in Arizona. 

30.  Do you sell magnetic water treatment devices to soften water?

a.  No, we don't sell the magnetic water treatment devices.  They can be more expensive then conventional softeners, and they don't work very well, if at all.  Many of companies who distribute these devices often make claims that are unsupported by scientists and experts.  A chemist, Mike R. Powell, who tested some of these magnetic water treatment products published an article called "Magnetic Water and Fuel Treatment: Myth, Magic, or Mainstream Science?" Search for it, you'll see what he says.

31.  How and when do I replace the fluoride removal cartridge in my double cartridge water filter system?

a.  The fluoride removal cartridge should be replaced yearly. When replacing the cartridge, it must be flushed without the KDF/GAC filter in the system. To replace, remove the KDF/GAC cartridge, then replace the housing cover and run water through the fluoride cartridge for 15 to 20 minutes to flush the cartridge. This must be done to prevent clogging of the KDF/GAC cartridge from any activated alumina that may be released from the new cartridge. Then re-install the KDF/GAC cartridge and you can use the filter. Note: The fluoride cartridge must be installed in the first housing (countertops: where the diverter connects; under-counter systems: where the water line is connected).

32.  Do you have to do any maintenance on the water filter housings?

 a.  Yes.  When replacing your cartridges, you should you inspect the black o-ring that is inside the long end of the housing (the sump) and lubricate it with food grade silicon grease if it's dried out (available at Home Depot). This is required to prevent leaks. We also suggest you bring in a water professional (master plumber) periodically to inspect the water filter, inlet /outlet fittings, water lines and faucet for potential problems and wear to prevent future leaking problems.

33.  What are chloramines, and what is the best way to remove them from our water?

a.  Since 2001, most municipalities have been adding chloramines (a combination of chlorine and ammonia) along with chlorine to kill bacteria and cysts (some only use chloramines).  Chloramines prevent TTHMs (trihalomethanes) from forming when mixing with organics in the water, and lasts longer than chlorine alone.  Unfortunately, chloramines are not as easy to remove as chlorine--they require a longer contact time with the media.  A single catalytic carbon cartridge, Filer CH, has been tested to remove most of the chloramines without the use of any other filter.  Recommended flow rate is 0.5 gallons per minute or less to effectively reduce the chloramines in your drinking water.

34. What type of carbon do you use in your KDF/GAC and carbon block cartridges?

a. We use coconut shell carbon.

35. How often to I have to replace my carbon block or carbon GAC filter?

a. Any carbon filter needs to be replaced every year, otherwise bacteria can grow in it. The expection is our KDF/GAC cartridge which can be replaced every 2 to 3 years. KDF within this cartridge inhibits bacteria growth.

36. Will reverse osmosis filtration remove arsenic?

a. Yes, and no. Reverse osmosis will reduce arsenic V (arsenate), but will not reduce arsenic III (arsenite). A special, patented, iron oxide media will reduce arsenic III.

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