Every 2 weeks I mix up a new batch 66L of new salt water to attain 1.026SG & 75degrees using RO water (0 tds) and Instant Ocean (purple pails). The result is always a dKH of 11.9.
Since my desired dKH is 8.2, I have been using 31.45% Muriatic Acid, then adding 30 ml of this acid to 66L of the NSW necessary to drop the dKH from 11.9 to 8.2 as per the Reef Chemical Calculators given in this forum.
Is there something wrong with these tables, since even when I add 5 times this amount of acid (150ml), the dKH only drops to around 9 dKH?
Since my desired dKH is 8.2, I have been using 31.45% Muriatic Acid, then adding 30 ml of this acid to 66L of the NSW necessary to drop the dKH from 11.9 to 8.2 as per the Reef Chemical Calculators given in this forum.
Is there something wrong with these tables, since even when I add 5 times this amount of acid (150ml), the dKH only drops to around 9 dKH?