This was a replacement for a 4 stage ultra filtration system which is actually not that good. I was able to install this block myself. The only problem I had was having to get the little plugs out. I had to use pliers. The only part I didn't trust was the hole in the drainpipe. I decided to pour the waste water into a gallon jug and was blown away by how much waste water comes out of a jar of water. almost a gallon. it's a lot of waste. I live in Arizona and we have to conserve water here. I don't know if this water is potable and filtered, but I plan to collect it for my room's humidifiers and kitty fountain. that is the reason for 4 stars. I had 4 stage reverse osmosis before the last one and there was no waste water. in any case, the water tastes just like the water from the water reservoir. It would have been 5 stars for that alone.
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