ro or ro/di

[Jack]

My hand-held TDS meter initally read 1ppm even when my RO/DI unit was brand new. I see 1ppm as my "0ppm". Maybe you should do the same with 2ppm? I can't imagine anything getting past a brand new RO/DI.

Also, it could be that our containers that we are holding the water we are testing are dirty.

Oh, and it's good you flushed the new RO because as Brad said there is a chemical in the membrane that needs to be flushed.

Teflon should seal up the threads but if not try a dab of silicone around the threads.

Hope that helps you out a little bit.