Such a valve in that place can dead head the pool system and would not be recommended.
If you are going to cut in a valve then put a 3 way valve in before the filter that can be used to divert water to waste.
It is a lot better to do some PVC cutting and gluing and installing a waste line then flooding your pool pad trying to drain the pool through the filter drain.
I "vacuum to waste" my cartridge filter with an actual vacuum - a wet/dry shop vac. I never remove the drain plug, only the guts of the filter, and I suck out the dirt that way. Then I can dump the dirty water elsewhere and not make a mess around my equipment pad.
Obviously. But some systems have individual valves on the returns and once the filter drain plug is removed, they would need to be turned to 'off' to divert all flow out the drain plug.
@Ezbagr I would add a 3 way to waste as Jim and Allen described, if you don't already have return valves. I don't use the waste function on my cartridge filter often, but boy do I love it when I do.
If you don't have return valves need a cheap temporary solution , you could use screw in winterizing plugs in the returns. Turn the pump off, open the drain plug on the filter, add the return plugs and fire the pump back up.
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