Feb 2, 2013 #1 Dutchz Aquarium Advice Freak Joined Nov 25, 2012 Messages 305 Is the ph coming out of an ro water system 7.0?
Feb 2, 2013 #2 jlk Aquarium Advice Addict Joined Sep 16, 2011 Messages 11,118 Location philadelphia suburbs It should be 7 (or neutral).
Feb 2, 2013 #3 OP OP Dutchz Aquarium Advice Freak Joined Nov 25, 2012 Messages 305 My test kit reads 6.0 yet we will very well will be finding the time to change the cartridges.