I've had pools for decades. I usually do a half drain every couple years, because of the high calcium content here in Az. The water in my pool is really, really clear - like read a newspaper on the bottom of the deep end with your sunglasses on clear. I just discovered this site, and I am now a recovering trichlor puck user but it got me thinking about how much CYA had built up over the last year.
I got one of them fancy Taylor test kits, and came up with the following:
CYA >100 (based on the distance below the 100 line, I estimate somewhere between OMG! and AAAAAHHHHH!!!)
I did an extra long backwash to pull the water level down to the bottom of the skimmer. When it finished refilling, I retested, and everything was the same - pretty much as expected, because it wasn't that much water. This time, I used the 50% tap water method, and came up with a CYA of 170.
Here's my question:
How long would you expect it to take for the FC to cook down to the point where I'll need to add some more liquid? Water temp is around 81, and we've got sunny days in the 100's for the next week. The tricky part for me is the effect of the CYA. I took my puck floater out yesterday, but the FC level is still hanging tough.
Ordinarily, I'd just do the daily test thing, but I'm going out of town for four days starting Monday. I'm trying to decide whether I should just leave the floater in while I'm gone so I don't come home to a green monster. Either way, I'll be pumping out about 3/4 of the water next weekend and rebooting with liquid sanitizer.
Thanks in advance - I'm glad I finally found this site.