I maintained a 25,000 gallon pool for a few years, with the help of this forum, and it's members. We have since moved, and now have a small 3,500 gallon pool. I was always more comfortable maintaining the large pool with a CYA of 20. Wasn't that hard to keep the FC levels up, and was easy to slam when needed. My current CYA level is 30, and I'm totally fine with that, but the charts say it should be higher. I still can't figure out why. Maybe someone can explain. thanks, Ed
Why do recommended CYA levels seem high to me?
- Thread starter edweather
- Start date
- May 3, 2014
- 58,612
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
If your FC loss is controlled at a lower CYA, great. Mine has to be 70 ppm at least or my FC loss jumps to well over 5ppm per day.
Obviously you've never been to a Bioguard dealer. they suggest 60-200 as the acceptable range for CYA. 
I have SWG, so I keep mine at 70. Anything lower than that and my FC hits rock bottom too quickly due to sun (I never cover my pool, and it gets undiluted sun for most of the day).
I might raise my CYA a little, but unless I'm losing my mind, and that's distinctly possible, my FC doesn't seem to drop much faster with less CYA.
Flying Tivo
TFP Guide
- Jan 24, 2017
- 2,966
- Pool Size
- 7500
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40