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I assume the high CYA was also contributing to my TA remaining high and my pH trending low in the past couple of years. Before that I was only having to raise the TA but pH stayed fairly stable. It was a mystery to me why this changed all of a sudden. I think I'm down below 50 ppm on the CYA...

First look after partial replenishing the water is a CYA reading of about 180 using the 50/50 and doubling the reading technique. Very discouraging.

OK, got it. Thanks! It took me awhile to wrap my head around the part about adding water not lowering the CYA concentration. First the evaporation concentrates the CYA, raising the PPM number. Then adding fresh water returns the CYA level to where it was prior to the evaporation. It does...

Re: CYA > 100, issue with FC in pool My CYA is off the K-2006 kit's scale, but estimated at between 150 and 200 ppm. I've been using 1-2 pucks a week for some time. They should put a warning label on the bucket. No backwash for the cartridges but I do replenish about 500 gallons or so 3-4...

Re: CYA > 100, issue with FC in pool I've begun replacing the pool water today. I hit on the idea of using the heated pool water to expedite the operation. I'm drawing warmer water from the shallow end and replacing it at the deep end with colder fresh water. The pool circulation pump is...

[Split by moderator from HERE to avoid hijacking, jblizzle] Same problem here with high CYA that I just discovered with my new K-2006 kit I got last week. And even though I've been lurking around here for four years, the relationship between the CYA and FC totally escaped me because I was...