I think I received a fake diaphragm and not a genuine Dow diaphragm. This unit lasted us less than 5 months before it broke down and was producing water with TDS/PPM levels of 176-198! When it was first installed the reading was around 10 but it slowly deteriorated to the point where it was essentially tap water coming out of our reverse osmosis system. I used to buy membranes from a specialist reverse osmosis supplier and they will give our family 2-3 years of reliable service before needing to be replaced. This membrane didn't even give us 5 months. I would recommend finding a better option.
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