Quote Originally Posted by Karin
Well, I went to the horse's mouth and called up Aqua Rite to ask them about their higher recommended CYA levels. After 10 minutes of listening to some vintage elevator music, the rep told me that the chlorine that a SWCG makes is different than the regular chlorine you just add to a pool.

That's why they want a higher CYA---to protect it from sunburn.

Was she just trying to get me to hang up, or does that sound plausible? Hmmm...
She told you the same thing that PatL34 stated above and the same thing that I have stated in other threads. There is a difference between manually chlorinating and producing chlorine by electrolysis. I have spoken to tech support at Goldline Controls, Poolsean, who is in this forum and works for AutoPilot Systems (Pool Pilot SWG's), and some of the dealer literature that I have access to from my job (the store I work at sell several brands of SWGs) all are saying the same thing. It is better to run the CYA level higher in a pool with a SWG. I run mine at 70 ppm with my Aqualogic PS-8 (Goldline Controls). I also test a lot of water all day and can access histories of test results. About half our customers have SWG's installed and there are several that have been running CYA at 30-50 ppm. I have notices that these people have not been able to maintain adequite FC levels, run their cells at very high outputs, and some have had problems with algae blooms, including Mustard Algae. I have not seen any of these problems in the ones running higher CYA levels and keeping the FC at about 3 ppm or slightly higher. It is a small sample, maybe about 50 or 60 customers but the trend I have seen is unmistakable!