After 6 months it's time to change the filters. Since I did this, the pump makes about twice as much noise as it originally did. Now from a click to a loud bang. I don't know what happened, but now it's MUCH louder. I have a 75GPD device so I think this is the right one. I would like to do something to make them quieter. Is there a QUIET permeate pump? Works well, a little louder than I thought but after reading other reviews I think it's to be expected. Improved performance and cycle time. Worth the trouble and the extra noise. It is located under the cabinet, so it is almost invisible when the TV is on. I put 4 just for extra noise, but the functionality has improved. Nice installation, had to order some extra fittings but I did it at the same time so installation was pretty easy. I also had to download a diagram of the reverse osmosis system to make sure I didn't screw it up.
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