Proper way to partially drain my pool

I have the dreaded 'way too much CYA' problem. CYA level is too high for the test in the K-2006 kit to measure. I have switched to Bleach and am keeping the Chlorine level between 8 and 15 ppm as suggested. Now I need to take the next step and replace some of the water. In-ground pool with a DE filter. Is it as simple as shutting off the skimmers and running the main valve in the backwash setting?

Thanks in advance.

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Originally Posted by KLang

I have the dreaded 'way too much CYA' problem. CYA level is too high for the test in the K-2006 kit to measure. I have switched to Bleach and am keeping the Chlorine level between 8 and 15 ppm as suggested. Now I need to take the next step and replace some of the water. In-ground pool with a DE filter. Is it as simple as shutting off the skimmers and running the main valve in the backwash setting?

Thanks in advance.

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Yup. Or you can even use the waste setting. It's just that simple. I did that at closing because I had to replace some fixtures and add a patch. Left just over a foot in my shallow end. We've had a lot of rain but I haven't checked how much has been added.

Just be sure you cannot suck air from fittings above the water line.