I originally gave this DIY reverse osmosis filter kit and pressure tank one star because 99% of the water went down the drain (brine) and only drips came out of my reverse osmosis faucet . Well, I didn't have everything I needed to get a usable amount of filtered reverse osmosis water that could fill an 8-ounce glass of water in under a minute (compared to a damn day). With this 400GPD reverse osmosis kit, I expected to fill that jar in maybe 15-30 seconds based on what I've seen with several complete reverse osmosis systems that cost around $300-$400 and which some of my had neighbors. After speaking to the seller's rep, I would give the seller (and their rep) a five star rating as well. The end result is that I am now getting the expected result. Like my original review, this new updated review is a bit "wordy". . .The reason I didn't get the expected result was more due to my ignorance of reverse osmosis systems. First off, in my defense of the harsh rating and the one star I gave, I should point out that this is being sold as a kit. In my opinion, this is not a do-it-yourself system - at least not a complete do-it-yourself system. However, this is a very good deal for a 400GPD filter kit that needs a DIYer and wants to build a complete reverse osmosis system. To me, a DIY product (the phrase "make your own reverse osmosis water filter now!") means everything. I need to add these components to an existing filtered water line and feed the RO filtered permeate to a dedicated faucet on my sink. Although I didn't expect this kit to include a reverse osmosis faucet and some other parts I need; I thought (and still do) that this do-it-yourself kit, sold as is, should contain everything you need to feed water to the reverse osmosis pressure tank and a useful amount of filtered to produce RO permeate water. . However, you need another very important ingredient to get a useful amount of filtered reverse osmosis water. This component is a flow restrictor (FR). With a flow restrictor, you're lucky if you get even drops of reverse osmosis filtered water. With no flow restrictor, there is no back pressure to force water through the internal RO membrane and most if not all of the water takes the path of least resistance (virtually no resistance) and exits through the pressure drain (brine). Ship. For this reason, the tank that houses the reverse osmosis filter is primarily referred to as the "pressure tank". Flow restrictors (FR) are rated by the degree of restriction they impose on flow. This is not a one-size-fits-all deal. You will need different sizes of FRs for different sizes of reverse osmosis filters (50 GPD, 75 GPD, 100 GPD, 400 GPD, etc.). Put simply, the number of restrictions you need depends on what you input and what you can do except in the output. So there is a relationship between input and output. There are many other variables and it's more complicated than that, but that's what it boils down to. With most reverse osmosis systems, for every 3-4 gallons of unfiltered raw water you add, you get 1 gallon of filtered reverse osmosis permeate water. Exit. The remaining 2-3 gallons go into the brine (waste) and sort of "down the drainβ. In the United States, where water is cheap and plentiful in most places, some people may use wastewater for lawn watering, gardening, bathing, or other purposes. As a rule, wastewater does not produce "bad" water, as the term "waste" suggests. The component you need is the (optional) automatic shut-off valve (ASOV or ASO). If you are supplying water to a holding tank or other tank, you will need at least one float valve to block the inlet to the reverse osmosis filter when the tank is full. It would actually be a different type of ASOV. I only want reverse osmosis water for drinking, although I understand that many people use reverse osmosis water for aquariums, maple syrup making, hydroponic gardening, etc. and use a more manual system and may not use an ASOV - but I think almost all reverse osmosis systems are suitable and should be be it. I did a lot of research online before purchasing any of the components to build my reverse osmosis system and nowhere I looked stated that FR was a critical FR component that wasn't even mentioned. I already had a fairly sophisticated set of filters in addition to a simple water softener for my rust colored well water with very high total dissolved solids (TDS). Remember that a water softener does not remove TDS, it only replaces dissolved solids of calcium, magnesium, etc. with sodium-based dissolved solids, so you still end up with about the same amount of TDS coming out as you go in. . While doing laundry and showering, sodium-based TDS wasn't a huge problem for me, but I didn't want TDS or any other crap (almost literally) getting into my drinking water. I should add that you REALLY want some calcium, magnesium and other TDS in your drinking water because your body needs some minerals. Unfortunately, RO filters or "throws out the good along with the bad". They actually make another 'filter' that adds 'good' minerals back to the filtered reverse osmosis water after the reverse osmosis filter. However, you don't need many other TDS in your drinking water, and some of these are very harmful to your health. When I bought this 400GPD kit it didn't come with a flow restrictor and the seller didn't even sell them. . . or mention that it is needed. I pointed this out in correspondence with the seller. The seller contacted me after reading my review to find out what the problem was and replaced the kit at no extra charge. I have left many good and bad reviews for many of my Revain purchases. I was impressed that the seller did this as it is not usual for me. I also give the seller 5 stars.
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