The multi-port valve may be attached on the top or on the side of your DE or sand filter. Six main functions are controlled with this valve plus one winterizing function. Please keep in mind that this article is for general information purposes only. Be sure to read your filter’s manual and follow the manufacturer’s instructions.

Multi-Port Valve Functions
1. Filter
2. Backwash
3. Rinse
4. Recirculate
5. Close
6. Waste

The normal operating mode will be in the filter position. Water from the swimming pool is going thru the filter and being cleaned and returning to the pool. You can vacuum your pool in the filter position. The debris from the pool goes into the filter. When you complete the vacuum process, remove your cleaning equipment and turn the pump off. Place the multiport handle in the backwash position. Turn pump on. Water will go out the backwash hose and fill up the sight glass on side of the value. When it is clear, turn pump off and put valve in rinse function. Turn pump on for about 20 seconds. This clears debris from plumbing lines inside the filter.

Related: Winterizing your swimming pool

If you have periods of heavy rain and notice the water level of your pool is getting very high, turn the pump off and place the multiport handle in the waste position. Turn pump on. This bypasses the filter and lets water go directly out the backwash hose. You can also vacuum your pool in this position if your pool has a lot of water, or you have a lot of dirt in the bottom of the pool you don’t want to vacuum into your filter media. The re-circulate function bypasses your filter and might be used when you use floc or alum in your pool (to clear up a cloudy pool).

Check your pump’s strainer basket weekly (at the minimum) to remove any leaves or debris. Depending on the conditions around your pool you may need to check it more often. When you open the lid to remove the basket, you are letting air in your plumbing lines. Place the multiport handle in the closed position first might help keep more water in your plumbing lines. Take it off of closed and go back to filter before you turn pump on.

For more helpful inground swimming pool tips, see your local Medallion pool leader, or contact us.