The previous owner's choice of chlorination was kinda that method. I have a chlorinator on the pump that takes tabs, and he used two floaters on top of that. The tablets and the shock he used were all "4-way" stablized. That's what got me into the mess with the CYA, any time he was chlorinating he was adding more and more CYA. If I'm gonna add chlorine now, I'll do it with liquid.
I'm gonna have to look into that. I have an electric robot now that roams the pool, keeps it pretty darned clean.
Cool, I've "switched" to liquid by purchasing some, but I haven't added it yet. My brother came over a couple days after we closed, and ran an initial test for me. He immediately yanked the floaters out citing the high CYA. So I can chlorinate up, balance the pH (today's #'s were in post 13), and then watch it over the winter?
Cartridge filters won't have a multi-port for backwashing as they won't require it. Just break down the filter and wash them out quarterly or if the pressure rises about 10-15 psi from normal. Pressure can vary depending on if your equipment is above or below the pool. So there isn't a set range, but ill usually break them down for a cleaning if they hit 30 psi. Backwashing is mostly required for sand and DE filters.
There are some cartridge filters that require DE. I don't have much experience with those, but it's my understanding they do not require backwashing either. Just ad fresh DE after a breakdown/cleaning of the filter.
Here's the label:
