Randy Holmes-Farley
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My Tank Thread
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I run the alk at 9.5 and have run by accident the alk container dry. It does drop pretty quick but not 7dkh.
That's the amount you are dosing to maintain the alkalinity, but you wouldn't see a drop that big because the demand is dependent on the alkalinity.
So at 10 dKH, the alkalinity and calcium are used a lot faster than at 5 dKH, where calcification comes nearly to a halt. Thus at 10 dKH you need a certain dose to maintain it, but at 5 dKH you'd need hardly anything.