Old membrane installed about 10 years ago and still tested at 25ppm. I installed this new one simply because it was probably time to do so. The first reading was 600+ ppm because the new membrane had to be flushed first. Plain, untreated tap water tested at 380 ppm. The ppm values kept getting lower. After two weeks of inactivity other than rinsing the new membrane, is the reading now stable at 359ppm and not dropping further? It's pointless? It was obviously a mistake to replace the old membrane with a new one. There are also brand new 1 micron carbon filters in the system, but that shouldn't matter. My reverse osmosis system produced about 20 gallons of water. This amount of water should be more than enough to initially flush the new membrane. I'll look for another brand of membrane to install if this new one doesn't do better.
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