WattsOFPSYS OneFlow Plus Salt-Free Scale Prevention and Water Filtration System, Carbon Water Filter, Scale Reduction Cartridge, 1" NPT Inlet and Outlet Connections

Bought this in Dec of 2020 after I hauled away our old GE water softener (salt). The OneFlow fittings were a bit of a pain to match to our CPVC system, but I got it done. I also agree with another reviewer who said there should be shutoffs on each side of this to make maintenance easier. I put 'em in, and yes, maintenance is easy. =)I've changed the big/outer filter twice (early 22 & now), and the inner once (now). Both times the water between the housing and the big filter was the color of brewed tea (no smell, but still disturbing). However when I pulled up only the inner filter, the water was clear as could be.A few weeks ago we started to see some minor hard-water deposits on the shower heads, so I went ahead and changed both filters (and O-rings). For the inner filter, that's the first time since we put the system in. Now that it's changed, I fully expect another 3 years of not having to worry about hard-water deposits.I can't say it will work for you, but in our book, we've certainly found the system to be worth the money.

We didn’t want an actual softener for myriad reasons but we needed a solution for the extremely hard water. After a week of research we settled in giving this a shot and have not been disappointed.Our house is new construction and I finally installed this filter after we’d been here for a month, and already fixture were accumulating scaling and we were running vinegar through the dishwasher. We saw that stop within a coyote days and while standing water that evaporate will leaves spots, those spots are more a dusty residue that easily wipes up. We are running the filter in sequence with an electromagnetic descaler (HQUA), which was installed simultaneously, so it is difficult to say how much effect is compounded by the joint treatment.The carbon filter does exactly what it’s supposed to. Tap water is now plenty satisfying to drink and the old chlorine odor is hardly present, if at all.Over all extremely satisfied with the installation process, the only difficulty was my inability to properly apply the silicone tape properly the first time to the brass threading.

I bought this in January 2020 and had a local plumber install it. Things were fine and water quality did seem better until this month. Now cracks have appeared above the inlet and outlet ports in the tank itself. The manufacturer Watts indicates that there is a 5 year warranty on the tank. When I called they said I had to go through Amazon since that is where I bought it. Now Amazon indicates the “window of support “ closed last year. I guess I’m just out of luck. Very disappointed in both Watts and Amazon on this.

I purchased this filter system on recommendation of plumber who installed new water heater. He showed me the inside of old heater (5 years old) and the amount of scale build up was astonishing. I purchased this system after reviewing what others said and reviewing the literature on how it processes water. I think it is a little expensive compared to other filters, however it also softens the water by removing scale ( Calcium and Magnesium ) as wells filtering the water for chemicals and sediment. I have recommended to friends and neighbors. It was easy to install using shark bite and plastic fittings.

Read the description, it does work as advertised. “Prevention”. But, in my case I was using it to replace a genuine salt style water softener. If your expectation is that you were going to use this product to replace the salt water softener, you will be disappointed. It does not match the spot reduction of a genuine salt system. Although it is way better than no system.

Water taste good filters are easy to change. Watts should improve the material quality if I have to replace the whole body every three years it turn to be expensive. I will give watts another chance to see how long it last.

I just finished installing this unit to replace a Colligan salt unit. I had problems with the threaded inlet/outlet adaptors leaking through the threads. I tried Teflon tape three times before using tfe paste which so far has fixed the problem.Other things to consider would be putting shutoff valves on both sides of the filter and a bypass system (if you have room) to bypass the filter and still have water to your house. The valve on the outlet side keeps your house plumbing system from draining back to the filter.Some people have noted the filter cost vrs salt costs. Our current salt price is over six dollars per bag. At two bags per month that is $432 for three years. Of course, there will be differences depending on water hardness and water usage.It might be helpful for some people if Watts could supply 3/4" inlet/outlet fittings instead of one inch. Many older homes have 3/4" piping. The new home we were living in in 2007 had one inch service lines.

I waited a few months (6) before i reviewed it because only then can you tell how good an item like this is.Pros:1. Easy install (some homes will need a 1" to 3/4" adaptor which i found at HD and had to use)2. Noticeable improvement to water taste and feel (very noticable and really works remarkably well)3. Scale reduction as it states it does do (not a water softener)5. High quality casing6. easy filter replacement and bleed valveCons:1. We HAVE NOT BEEN ABLE TO GET RID OF WHISTLING SOUND WHEN WATER IS RUNNING - i talked to watts and made sure no air in system and even used dremal tool and file to change shape of exit piece, i have changed tone and intensity but still whistles. No idea at this point what i can do but i don't want to throw out a 700$CND item.Only way i can get rid of it now is to reduce water pressure but at such a low pressure it's useless to actually use water for anything.2. Plastic quick connects leak , not much , but drips a little3. the 1" to 3/4" standard plumbing brass reducer was very hard to get a good fit. This unit comes with two sets of exit / entrance quick releases with no explanation of the difference but i think its thread pitch ? but had to put 4 layers of thread tape to seal the brass adaptors to one set of exit/entrance adaptors and it was hard to screw them in at that point and didn't want to break them. We used standard sharkbite fittings for the rest of the installation with PEX pipe to go to/from water line.4. Scale reduction seems to be less after 6 months -- its a quantitative opinion and not an actual measurement. This city has moderate high hardness at around 8.8 grains/ gallon up to 15 grains in some parts. We had it measured at 12 and 11. Flow also seems to be reduced - so we will check the filters. Taste and smell and feel of the water is still very good.Overall i'm on the fence, it does reduce scale and vastly improves the feel and taste, but some of the other issues balance this out. If we cant get rid of the whistling I will probably scrape it and will write up a follow up review . Certainly unhappy about that issueI am in the home building business and if these work as advertised we would recommend more to be installed, but our own home was trial firstEDIT - fixed the noise .. the filters sat to low which caused the discharge tube too be at an angle, raised filters a 1/4" with a pad and that fixed issue -- changed rating to 4star