I have a cartridge filter and don't have backwash / discharge hose
I found cheaper and faster solution - two pool vacuum hoses. Sucked the air out on one side using wet vac, other side in the pool through the skimmer opening (so it doesn't suck too much water out). draining speed is amazing about 20 min and the water level is back to where it should be.
the best part -I don't even have a pool vacuum, these hoses have broken attachments but for some reason I never threw them out

Thanks.