Hi, I'm on year 3 of TFP-ing. The first two years I had a CYA at just 30 and had a hard time maintaining it there, adding a bit more mid summer. This year I thought hey, I'll add an extra pound and a half to make up for the loss in the cartridge or wherever it went. There was always the missing 10% or more. I always used sock-in-front-of-skimmer method with me squishing the sock/bag every hour or so. This year, I recently opened at 0 CYA, adding the target CYA using Pool Math plus extra, did the sock/bag thing, but started late in the day. I didn't want to leave the bag hanging in front of the skimmer overnight without the pump running and so I moved it to a 3 gallon bucket to 'rest' overnight, then the next day finished the job. I noticed the CYA was coming out much easier and seemed to be more dissolved overnight, as expected.
It's been a week, plenty of time to dissolve what might be left in the filter, and lo and behold - my CYA is at 70! I got a 60, 65, 70, 75 depending in the sun or shade. I tested a lot because I simply did not believe it. I should add that I AM using a different brand of CYA from Menards (Utikem brand), not the typical from Wal-Mart (Clorox I think).
A few questions -
Do you think the brand type changed the % dissolution of the CYA? Is the brand variability enough to matter?
Do you think that leaving it in the sock in a bucket of water overnight helped change the % overall dissolution? Or, just the rate.
My plan is to just ride this out this summer at 70, sucking up having to keep it at 8 instead of 5. (Will this cost more in terms of added Chlorine? Or does it even out given I am adding about 3-4 FC per day regardless of whether CYA is 30 or 70?)
Or, should I drain a few inches, add fresh water, or just know that we only have 2 more months of pool time left and it will all disappear over the winter?
Thanks,
Kristin
It's been a week, plenty of time to dissolve what might be left in the filter, and lo and behold - my CYA is at 70! I got a 60, 65, 70, 75 depending in the sun or shade. I tested a lot because I simply did not believe it. I should add that I AM using a different brand of CYA from Menards (Utikem brand), not the typical from Wal-Mart (Clorox I think).
A few questions -
Do you think the brand type changed the % dissolution of the CYA? Is the brand variability enough to matter?
Do you think that leaving it in the sock in a bucket of water overnight helped change the % overall dissolution? Or, just the rate.
My plan is to just ride this out this summer at 70, sucking up having to keep it at 8 instead of 5. (Will this cost more in terms of added Chlorine? Or does it even out given I am adding about 3-4 FC per day regardless of whether CYA is 30 or 70?)
Or, should I drain a few inches, add fresh water, or just know that we only have 2 more months of pool time left and it will all disappear over the winter?
Thanks,
Kristin