Anyone use Foster&Smith KALK

Jyetman

Active member
It seems I been having to almost double the dosage amount to maintain ALK and Calcium. I been adding 5 TSP per 5 gallons and my PH meter shows under 11. Why is my dosage increasing to maintain 10 DKH and a low CA of 380 PPM? The 5 gallons only last 2 days. My tank is only a softy tank but the water has high DOCs could this be the reason for higher KALK dosing?
 
I'm also adding 2 TSP of Seachem Reef Builder to my 15 Gallon top-off bucket. Should I not trust API test kit readings?
 
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