Today, i am dosing about 52.8ml of two-part Alk mix daily (two weeks ago raised it from 36.3ml/daily) and I'm not able to keep the levels stable. However, my math tells me I'm dosing correctly.

A few months ago i shut down the dosers and watch the levels drop for a week to get a sense for what was actually getting consumed. I took the daily average consumption and set my dosers based on that - it didnt work.

Then, while still dosing and readings dropping similarly to what is in the graph below, I did the same calculation to come up with what i thought i needed to add additionally and increased the dose to what I'm at today. The consumption is still higher than the dose.

What am I doing wrong? Is the math broken or am I not considering a variable?

Thanks.

system is 140 gal

ph-7.88

alk - 6.06

ca - 423

mg - 1360

sal - 1.025