In my system, pH is 7.5 to 7.8 after the carbon block and I use 72-75F water. I just use a 1 micron carbon block, and it handles all the chloramine and chlorine. I'm going to test ammonia after my RO membrane now - I'm curious how much is getting to my DI resin.
Also of note, NH4 generally isn't toxic to fish, but NH3 is lethal.
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~ Mindy
SPS fanatic.
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