Watts 5-PK-4SV Premier 1-Year 4-Stage Reverse Osmosis Replacement Filter Kit

• Complete 1-Year Supply
• Carbon Block Technology

I had purchased a used R/O unit. After Disinfecting it and installing the new filters and a membrane we have had great water for the past 6 months

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This is an excellent replacement filter pack for your Watts R-O system. Watts filters are very high quality and do a very good job producing clean, good water for any residence. Highly recommended.

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Though these filters work, they are NOT Watts Premier. Quality is noticeably less. The final stage carbon filter does NOT come with new connections, you must reuse the old ones off your previous filter, or buy new ones. Watts Premier supplies new connections with their filter kits. This kit is reasonably priced and the filters fit fine, but buyer beware you are NOT getting what is advertised.

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So far so good no leaks,Installed 2 months ago, waiting to see if it holds up for a year. If all goes well would buy again.

PRO 10 inch filters designed around STANDARD 10 inch tall filter holders not for customs

PRO each sub filter in the pack is individually wrapped to keep them clean good idea

PRO while the spun 5 and 1 micron filters make a seal by compression in the chamber, the carbon block filter has a rubber seal on top and bottom to ensure water must go through it.

comment filters always filter from OUT to IN dirty water comes in the outside of the filter then travels through it to a hollow core and exits the top and is piped to the next filter holder''s outside surface. Again it goes outside to inside. This is the standard.

TIP when purchasing new RO systems, look for standard 10" filter systems and changes

will be cheap and easy because there are 2 standards 10" and commercial 20" filters.

AVOID custom 1/4 turn or custom steel filters you can buy systems with clear or opaque filter chambers clear chambers have pros and cons you can see the contamination, but they let light in which promotes algee growth.

A typical RO system has 3 prefilters First a 5 micron sediment, then carbon block, then 1 micron in that order before the water even gets to the RO membrane (I use a waste water pressure booster to double my pressure going to the membrane by using twice the volume of wastewater, which RO aways has plenty of to boost input pressure by 2x to 80psi. I get 40 psi from the city water, and my tank goes to 80 psi.

Keeping your RO membrane clean is imperitive to the proper function of the total unit giving clean, potable water with almost no total dissolved solids (they get flushed out the wastewater) and also gives sterile water w/ UV sterilizer in series (replace bulb yearly) and a standard refrigerator taste filter on the output line to drink for good tasting water. I measure 3ppm TDS on my output. Distilled water is 1.0 ppm for battery maintenance. That is very low dissolved solids from 500 ppm at the street!

On my system I T''ed off the 14 gallon oversized storage tank and ran that water, which avoids the UV lamp and the refrigerator filter, to a 25 foot long piece of tubing that terminates in female hose fitting (backwards i know you want male hose fitting but I fixed it with a shutoff valve that was male-male) so on the end I paid 8 bucks for 3 pvc fittings including a ball valve I go hose to 3/4 pipe thread, rinto the 1/4 turn ball valve, then back to 3/4 pipe fitting to male hose thread. All pipe fittings are teflon taped and the hose fittings have washers for zero leaks. There is also a 1/4 turn 1/4" tube shutoff valve on the T off fitting which allows me to fill the dog water dish (1 gallon) or connect a hose to my pressure washer and wash the car with 10 gal and no residue, no spots afterwards very nice to have! When I''m done I close the 1/4 turn valve at the tank (14 gallon extra large tank from amazon Reverse Osmosis Storage Tank 14 Gallon White

This use (me, my dog, my car) keeps my RO flushing quite a bit per day and that is good because the membrane is kept clean by flushing. But it also means my prefilters need to be changed on a strict 6 month schedule since they filter 6 times the amount of RO water you get. The last filter is the same as refrigerator filter. In fact my fridge filter just counts 6 months then turns purple (blue+red means time to order filters) at 5 mo. and turns off the blue for red only at 6 mo time to change filter now! (when you press the reset button the 6 mo cycle starts over don''t do it unless you really changed the filter because after 6mo bacteria begins to grow on the filter media and water taste is bad)

Just FYI I live in a VERY hard water area with no chlorine from a well and pump at the end of the street low pressure, high content of dissolved solids, hard (12.2 grains/gallon) water is what I get from the city. I use a whirlpool salt ion exchange water softener to help cut down the solids but it only EXCHANGES the calcium and magnesium for Sodium does not make spots as bad, but its still in the water. See my review of bubble bandit case quantity Carton of Bubble Bandit Dishwasher Detergent with Phosphate. Cleans your dishes the way they use to be. Five 60 oz Bags (19 lbs)FREE PRIORITY SHIPPING AT CHECKOUT! it adds 8.7 percent phosphate to your detergent load to aid cleaning with hard water environments. Use less if you have a water softener about 1/3 normal and less soap.