Watts Premier pH Balancing Ceramic Post-Filter with 3/8" QC (Quick Connect) Fittings for All RO Reverse Osmosis Systems, Water Filter Replacement, 6 Layers, Fits 3/8" Faucet Tubing

Installed this on a non-Watts 4-stage RO system. The instructions say to put this after the filters but before the tank, it even tells you water can flow both ways through the filter (in and out of the tank). But Watts' website says to put it before the faucet, which contradicts the instructions sheet (and every other mineralization filter I've seen - and what everyone else here seems to be doing). But they never mention anything about the post-carbon filter. I called Watts and they said to go with the instructions. Putting it before the tank means that the mineralized water will then flow through the post-carbon filter afterwards. Not sure if that is good or bad for the post-carbon filter. It also means water now flows twice through the Watts filter (going into and then out of the tank) which might use the filter up faster. But on the other hand, maybe going through the post-carbon filter after helps the taste of the mineralized water. Either way I wish Watts was clearer about it. The water now tastes slightly different but so slight that you stop noticing after the first glass. Ph went from around 6.5 -7 without it to 7.5. Not a big difference.

Using this as the final stage filter in our APEC ROES-50 reverse osmosis system. We used the RO system without the Watts filter for about 1 week. Believe it or not, after drinking our normal coffee brewed the same way, I experienced acid reflux out of the blue. Never had acid reflux before with our unfiltered water used to brew coffee. I knew that RO systems increase the acidity of the water, but I didn't think it would actually produce symptoms! So, we added the Watts filter in hopes of raising the pH of our filtered water. No more acid reflux after drinking coffee! Water tastes nice and neutral too, a very pure taste and great mouth feel. I also tested the water using an API dropper test kit. The pH went from a 6.4 (slightly acidic) to about a high 7 or even an 8.0 with the Watts filter (see attached pics)! Don't hesitate on this one.

For the longest time I debated over the constant use of RO water, being that it lowers the PH and becomes very acidic.I decided to add this filter between my RO Pressure Tank and Faucet head, in doing so it really bumped the PH up. The reading before filter was 5.1 through 5.5 (verified from a digital PH Meter). Post installation the Ph boosted to 10.8! I was pretty shocked by that much of a jump.After running a tank or two through the filter (my pressure tank holds about 2.5 gallons). The PH remained stable at 9ish. I decided to move another filter (Woder 10K-JG) after the Watts filter (to drop the PH). This worked well and now my readings are between 6.5 & 7.3.So that noted, please understand the proximities might have a factor on the increase of PH. If readings lower I will reverse the setup as overtime and use the filter will degrade the performance.

I bought this for use with a WHER25 reverse osmosis system. I've been using RO's for years, and just recently discovered that drinking the equivalent of distilled water may not be beneficial. This pH balancing remineralizer seemed like a safe bet after comparing it to the other remineralizers and alkalizers on the market. As of this writing the cost of the 13" is 50% more than the 11". I would probably buy the 11" at that price difference. The item shipped in 2 weeks, although it is advertised as 3 - 5 weeks.First, it does add alkalinity, and it definitely moves the pH to alkaline. I posted a jpg of the test results, comparing the RO with and without the remineralizer, tap water, and KDF filtered water. Note that the test was done with pool test strips - not the most rigorous science. Some remineralizers caution that the water should flow through slowly. It might be advantageous to run the faucet at a lower volume to let the filter have the maximum effect. I was able to improve the alkalinity this way.The remineralizer does not include tubing or a bracket. The hardware store supplied a 24" length of 3/8" O.D. tubing. I had room to tuck the remineralizer in the corner next to the RO and did not need a bracket. It is fair to call the fitting quick connect. To replace the remineralizer take the pressure off the faucet - on my system removing the post filter does that. Then push up on the bottom of the quick connect fitting where it is pushed on to the remineralizer. It slides right off. Leaks are always an issue for me with plumbing, but this connected dry and tight.Before this the RO water tasted kind of flat. The remineralized water tastes a little different. It's definitely not worse, and maybe not better, just different. It is alkalized, and somewhat remineralized for approximately $30, and that is a good return on time and expense.

Raised PH of acidic RO water, RO water pictured on left at 6.6, PH filtered water on right after running RO water through the Watts filter. PPM was 11 on RO water, 23-50 PPM after filter.Update: after using filter for 3 days, PPM lowered to 16-18 range. Water initially had a musky taste, after 2 refills and draining tank, it tasted great. Slightly sweet tasting water, much better tasting than the Apec PH alkalinity filter. Would buy this again in the future. I place this after my second stage Carbon filter, it's the last filter before going to faucet.

It quickly arrived, I installed it, and the taste of the water is very good.