I agree with Mason, 400ppm Ca is fine, more than fine actually, anything over 300 is not bad (assuming you have the Alk to match). In fact, pushing over 400 runs you the risk of getting Ca and Alk out of balance. I.e., it's no good having Ca at say (for hypothetical example) 500ppm if you alk is 1.2 meq/l.
What is your alk sitting at right now?
To be honest I don't bother measuring Ca on a system with a Ca reactor .... just alk.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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