Re: The chlorine gremlins stole 25ppm in 2 days
I second adesalvo's advice...you have algae or other organics to kill and that's evidenced by your green line even though you have clear water. Kill the algae first. The retesting and redosing a few times a day is the only way to be sure it's gone. I agree that for this stage, turn off the SWCG and use bleach or liquid chlorine.
Once the algae's gone, increase your CYA and follow tphaggerty's advice to be sure your SWCG is operating properly.
As for your decreasing CYA reading...I know that I can only get a +/- 10ppm on that reading when I do it. The same sample can seem like 30 but when I redo it, maybe it's 35, maybe it's 25, etc.
This is my first full summer with the SWCG and I can see that I need to go higher than the 45-50 CYA I had when the unit became operational last August. When we've had the intense sun and 90+ degree days, my FC was not holding where I wanted it to be, given my pump run time and my SWCG setting (both of which also influence the FC in the pool). I'm heading for 60, which, ironically, is the minimum CYA suggestion for my unit. I have to wait for all this rain to stop before I can tell if 60 will be the right number for my pool.
Sandy
15,600 gallon, screened 15x30 IG plaster sport pool with 6x8 tanning area, Aquarite SWCG, Hayward cartridge filter, Polaris 280 cleaner
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