K,

Yeah, I knew you wouldn't like that answer...don't blame you, I wouldn't either.

How much you drain your pool is your option. The resultant CYA ppm will be higher, the less you drain.

Since most SWG's suggest 60-80ppm CYA, that means you'd need to drain 50% of your water to get your CYA in that range.

The only option I can think of is to run your Cl level up to 4-8ppm (I'm guessing) and keep it there with a combo of bleach and your SWG. That will keep your pool sanitized and prevent any algae. Then, you can hope for Winter rains and let them dilute your pool to a manageable CYA level. That'll be slow going for sure.

If you dabble at lowering it....say a foot at a time, you can do the math and find you will use a LOT more water to get the same results.

Off the subject, but as Mark suggested your Calcium is as high as it needs to be and the salt is supposed to be around 3200, I think. You could bring your calcium into a more normal 250-300 or so if you decide on the 50% drain....You can't get it out inexpensively either.