Thanks for the info on the bromine. I really don't have an aversion to CYA, just am curious, really. Like I said earlier, if it ain't broke don't fix it. I will probably land up going back to my current levels after the refill in spring, since it's what's been working for some years now. Though maybe a little lower on the CYA (currently at 40). Maybe shoot for 20 or 30. What did they do in the old days before CYA? Must've had to check levels every few hrs during the day, is my guess. Anyways, thanks for bearing with my inquiries and maybe crazy ideas

Ken