If you aren't already using a ca reactor you could you the "reactor" you have with your calcium media you could run your top off water through it. To lower the pH of the top off water try using a bit of white vinegar in it. If you do a search of kalk reactors you'll find the directions to add the vinegar with the proper amount. The vinegar being acidic will lower the pH of the water and you should get more calcium media reacting with the top off water.
Douglas
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