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Multiport Valve

Multiport Valve Settings

What does the Multiport Valve do ?

Image result for midas multiport valve

The multiport valve on your swimming pool system is responsible for directing the water flow.

There are generally six settings on the valve.

1.   Filter - sends the water through the filter and back to the pool. This is the normal setting for any multiport valve.

2.   Backwash - this sends the water backwards through the filter to flush out the dirt inside the filter. It then directs this water out to the backwash pipe or hose.

3.   Rinse - this sends the water through the filter, as in normal filter mode, but then instead of returning the water to the pool, it sends it to the backwash pipe or hose. This is to enable the pipes to be cleared of debris after a backwash cycle.

4.   Recirculate - this bypasses the filter and sends the water directly back to the pool. This is not advisable for long periods of time but can be useful when some particulat chemicals are added that require that they do not go through the sand.

5.   Waste - this directs the water from the pump, directly to the waste or backwash line.

6.   Closed - this does not allow water to flow any direction through the backwash valve. Do not try to run the filter with the valve in this position.

Whenever altering the setting the pump must be turned off first.

It is good practice to getting used to rotating the valve in one direction only, I.E. clockwise or anticlockwise, when changing the settings as this helps preserve the life of the spider gasket inside. It makes no difference which way as long as you stick to that way.

Multiport valves do wear out and the most common item to wear out is the spider gasket inside, this looks like a wheel with spokes.

It can be replaced but is a tricky job, it is often worth considering changing the whole valve instead of repairing it.

Shaft seals also wear out on these and allow water to pool around the base of the handle.

Most multiport valves have a sight glass attached which is part of the backwash port, this is so that you can see the colour of the dirty water you are expelling when backwashing and works as an indicator at to when you have allowed it to run for long enough as the water will then become fairly clear.

Multiport valves also usually have a pressure gauge fitted, this is for you tom monitor the pressure within the filter and give an indication as to when the filter needs a backwash.

The time to backwash is when the pressure reaches 5 P.S.I.  above its clean running pressure, so if for example after you have cleaned the filter it is running at 18 P.S.I. you should backwash again when it reaches 23

As a rule of thumb an outdoor pool should be backwashed once every week and an indoor pool once every 2 weeks.