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Is it becoming solid all the way thru, or just the surface?
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<font size="2" face="Verdana, Helvetica, sans-serif">Just in areas around the corners of my tank where there is good flow of water.
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Are you using a fully saturated solution of kalk? That is 2 tsp/gal. Are you adding vinegar to the kalk solution?
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<font size="2" face="Verdana, Helvetica, sans-serif">Ya! I guess I should cut back on Kalk and see.
And yes! I did use vinegar for about a month but stopped after finding my alk was dropping too low.