Sometimes a swimming pool gets overwhelmed with leaves, algae, and debris on the bottom, which the standard automatic pool cleaner can’t cope with. Or we have a time constraint in which the pool needs to be cleaned. In this post, we will be discussing which is the correct multiport valve position to use when vacuuming a pool with a sand filter.
You don’t want all of that debris to pass through the sand filter and clog it up. Firstly switch off the pool pump. Both the weir and pool pump baskets must be removed, cleaned and refitted.
Just to make sure that they are not already blocked which could cause a restriction in water flow when vacuuming. Check to see that the swimming pool water level is at least half the height of the weir opening. The vacuuming process uses a lot of water.
The Multiport valve has six positions. Filter, Rinse, Recirculate, Backwash, Waste and Closed. Because there is a lot of debris sitting on the bottom of the swimming pool the multiport setting must be on WASTE.
Remember to push down on the handle before turning it to the Waste position.
When the Multiport valve is in the waste position the dirty swimming pool water is going to bypass the sand filter and flow straight out the waste outlet pipe into the garden or drain.
If the Multiport valve is in either the Filter, Recirculate or Backwash position all the debris that is being sucked up from the bottom of the swimming pool will be passing through the sand filter and back into the pool.
The sand filter will quickly get clogged and the smaller debris particles will be pumped straight back via the return jets straight back into the pool. This is a situation you do not want.
Connect the weir cover and pipes to the manual vacuum unit. Switch on the pool pump and continue vacuuming. When vacuuming is completed switch off the pool pump.
Remove and re-clean the weir and pool pump baskets. Replace the baskets. Check the swimming pool water level and fill if necessary. Test and correct the PH and chlorine levels after filling the swimming pool.
Reset the Multiport valve to filter for normal filtration.