To vacuum to waste with a cartridge filter, first, turn off the power to the pool and remove the lid of the filter. Then, attach the vacuum hose to the suction port in the pool and place the other end of the hose into the skimmer basket. Start the pump and prime the vacuum hose until water flows out of the end. Then, turn off the pump and switch the multi-port valve to “waste” mode. Turn on the pump and begin vacuuming the pool, making sure to keep the water level above the skimmer opening. As the debris is collected in the vacuum, it will be sent directly to waste, bypassing the filter. Once finished, turn off the pump and switch the multi-port valve back to “filter” mode.