Quote:
Originally Posted by moze229
Originally since day one I've used the Dow Filmtec BW30-1812-75 membrane but they phased that part and replaced it with BW60-1812-75. This is the one that I'm currently using.
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So you
have replaced the membrane? When? How old is your current membrane?
For your output TDS to be the same as your tap water, the water must be completely bypassing your membrane (or blowing right through it), although the way membranes are made and normally plumbed, I'm having a hard time visualizing how that could even happen.
Are you sure there are not valves open (or closed) somewhere that cause the water to bypass the RO membrane? Who is the manufacturer of the original RO/DI system?