This is weird. I have a salifert Ca test with expiry date 02/2022.
When tested the water last week my Ca was a 475 so decided was to high for my liking. Turned off the dosing pump and tested for a straight 6 days , some of the days even twice. Today I even try the new instruction after firs reading was 470, and second reading was 475.. all week Ca was fluctuating from 475 to 465 without even dosing. I keep dosing alk and mag and value are stable at 7.3 and 1245. But what bug me is the Ca. I dose the new formula AF component where Ca and Mag are not mix together . I
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