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You're welcome.
Pool Doc,
Its been awhile since I have been on the forum but I thought it was not good to have your CYA so high (as 100+) as the only way to get rid of it is to drain the water from the pool and high levels of CYA force you to keep the FC very high. I always targeted a CYA of 40-60 so I could keep my FC at the 3-5 PPM level. Or am I remembering wrongly?
JP
That's true, but if you maintain the ratio between chlorine and CYA, your chlorine consumption doesn't increase, as the levels increase.
What does happen is that you are able to 'store' more and more chlorine in the pool. When you get to CYA = 150, you can add chlorine just 1x per week!
Jumping in late here, but I have a Polaris Auto Clear Plus system on my pool, going into its sixth season. I had some issues with it apparently not producing chlorine last year, and although the plates looked clean I decided to try soaking it in a muriatic acid/water bath per the manual's cleaning instructions. This seemed to rejuvenate it, and it is working fine so far this year.
Just cleaning the cell with a muritic acid solution on a 3 year old system did the trick of getting it to work again. May be worth the try.