I just watched the video's from ACI. I dont remember the exact quotes but the guy form ACI tells after raising his ph trough koh he had to add far less kh (calcium reactor) while having 30% + growth. He thinks the carbonic acid does things to the kh/carbonates (I think he also thought this happened to other ions like ca) that makes it react/participate so the kh drops. He also said caoh and koh doesnt add kh, part of his proof is his ca and kh are still balanced while adding koh. So he is wrong?
Adding hydroxide tends to raise pH, and that rise can increase both abiotic precipitation of calcium carbonate and coral calcification. Usually, one would not expect alk to actually decline, but it can. The drop may also be test error. The Hanna has a specification of +/- 0.4 dKH at 8 dKH.
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