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Originally Posted by RTR I though that GH only read divalent ions, not the monovalent such as Na+, K+ ? That would be a huge error source and is contrary to my experience. |
RTR,
Your absolutely right. I don't know what I was thinking but thank you for catching that. I'll go correct my post now before it messes anyone up.
banderbe,
RO would be an option for you or you could setup the the tank with hardplumbing to a water suppy and a drain, then all you have to do is open a valve, drain 10-20% then close that valve and open the other to refill. Changing that smaller amount should not cause anough of a temp change to matter and you can add a Ccapful of prime while filling to neutralize and clorine/amine.
Remember that in nature water temps can drop a lot after large rains so some temp. fluctuation is perfectly fine.
Dennis