One way you might vac to waste with an intex is unscrew the hose where the water returns into the pool from the filter and let that water out on the ground. Wouldn't that do it? Or would you loose the suction and it wouldn't work? Seems like a lot of water to dump though. With the leaf vac attached and the cartridge in I think it would be ok just to vac. He must have a diffrent filter.. Kimrst