Hello. This morning I measured FC before the sun came out and got a reading of 4.5. I tested again jsut now 4hours later and the reading is 3. Can FC Drop this much so quickly or is something else at play?
If your CYA is low and you've recently had very low chlorine, you'll probably go through chlorine faster. Get the CYA up and maybe operate at higher FC level for several days and you'll probably see an improvement in stability of your FC level.
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