For a variety of reasons outside my control, I am still stuck with very high CYA. 140 consistently. So I keep CL high - 12 to 16. In anticipation of leaving on vacation, I let CL drop so I can get an accurate pH. Then I'm gonna shock it before I go.
4/9 CL 16
4/11 CL 13
4/12 added 1/2 gallon 10%
4/15 CL 12.5
4/17 CL 11
4/19 CL 11
I have added quite a bit of acid to keep pH down and reduce TA, but no Chlorine for a week. Typically it works out to using about a quart a day, in full sun. All the sudden, it just stopped dropping. Does Chlorine flat line because of the CYA? Is this as low as it's gonna get? The water is crystal clear.
On a side note - would this be a way to tell what the CYA level is?