How to Use a Swimming Pool Multiport Valve

Written by ehow home & garden editor
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Multiport valves go by a variety of names including the filter control valve, the backwash valve or the Vari-Flo valve. The multiport valve controls the direction and flow of the water in your swimming pool. You can locate the multiport valve near the swimming pool pump and filter.

Skill level:


  1. 1

    Identify the settings on your multiport valve. Multiport valves may have three to six settings. You change the settings to make the multiport valve perform different functions.

  2. 2

    Filter the pool through the multiport valve. Almost all multiport valves contain a filter setting. This draws the water through the pump and filter system and returns clean water to the swimming pool.

  3. 3

    Flush out the filter with the backwash setting. The backwash setting releases trapped particles from the filter back into the swimming pool. You may need to alternate between the rinse and backwash settings until the water runs clear in order to unblock your filtration system and flush out clogs.

  4. 4

    Rinse away dislodged items from the backwash setting. The rinse setting flushes clean water through the pipes and carries away any particles or clogs freed during the backwashing.

  5. 5

    Drain the pool. Some multiport valves contain a waste setting. This sends the water directly to the drain rather than back into the swimming pool.

  6. 6

    Close the filtration equipment and stop the pump with the closed setting. You should only use the closed setting when you turn the pump off. This function allows you to remove the strainer basket, clean the filter tank and perform other swimming pool maintenance on the filtration system.

Tips and warnings

  • Different multiport valves may use different setting names, but the functions should remain the same.

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