Quick vac uses siphon action to remove the dirt, debris, and grit that accumulate in your spa. Just insert the suction tube into your spa, shake the tube, and the quick vac goes to work quickly removing debris and transporting it out of the spa through the discharge hose. It is just amazing how much suction the siphon develops, removing glass, pebbles, sand, and leaves. The quick vac discharge hose is 8-feet long and drains about one-gallon per minute. Spot clean in as little as 3 or 4 minutes.