Pool Sand Filter Maintenance

Pool Sand Filter Maintenance & Pool Filter Problems. Avoid Mistakes & Check Your Sand Filter Pool Pump & Equipment Repairs To Reduce Your Pool Maintenance Cost.

Sand pool filters will have what is known as a “Multi-Port Valve”. This valve is an all-in-one valve that makes your pool life a little easier.

If you're not familiar with a Multi-Port Valve please read the following and/or consult your owner's manual concerning your sand pool filter maintenance. 

If your swimming pool motor (pump motor) is on and you decide to start turning any valves, that could cause all kinds of swimming pool filter problems.

Be sure the filter pump motor is off before turning anything. 

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pool sand filter maintenance, backwash pool filter, pool filter sand, swimming pool sand filter, pool filter system, Swimming Pool Tips, pool water maintenance, inground pool maintenance

Pool Sand Filter MPV Settings

The settings on this type of valve are as follows:


This is the normal setting for the valve. The pool water is drawn through the pump, passed through the filter, and is then returned back into the pool as clean water.


This setting is used to flush out the filter when the sand filter media becomes overloaded with dirt and debris. Water is drawn from the pool, is passed through the filter sand and then exits out of the filter as dirty water. A high pressure sand filter means it's time to backwash

Once this part of your swimming pool sand filter maintenance is accomplished your system is ready to rinse. DE pool filters will need to recharge your grids with fresh DE.


This setting is used to flush out any dirt, debris, or excess pool filter sand that may remain in the lines after backwashing and only requires about 10 seconds. This water then exits as waste and not back into the pool.


This function allows for the pool water to circulate without passing through the swimming pool filter sand again. To be used when chemicals need to be mixed in the pool.


This setting runs water from the pool directly to the drain and can be used when lowering the water level, when certain adjustments are needed, or when vacuuming large amounts of dirt.


This setting is to be used ONLY when the pump motor is off. Closing this valve while the pump is running could seriously damage your pool water sand filter. 

Use the Closed setting when: 

  • Performing any swimming pool sand filter maintenance
  • Replacing pool filter sand
  • Changing sand in pool filter
  • Making any repairs to the sand filter parts
  • Cleaning the filter unit or filter basket

If you have any questions or are not sure about the Multi-Port Valve or any part of your sand water filters, check with your local pool store and find a qualified pool technician. 

Pool Sand Filter Maintenance - Backwash

Backwash Sand Swimming Pool Filters

For proper care of your inground and above ground sand filter, and to keep your rapid sand filter running at peak performance, you need to backwash your filter when the pool system calls for it.

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This is normally 8 - 10 Psi over the "just backwashed" pressure. Here's a normal backwashing cycle for a swimming pool sand filter.

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Once again, if you're even the least bit unsure of performing any part of this pool sand filter maintenance, check with a qualified pool technician.

  • Raise the water level 1"-2" if it's low. Turn the pool filter system OFF and clean the pump basket. Remove any debris and carefully place the basket back into the filter pump housing and reattach the pump lid. Check the gasket or O-ring and if it's torn or broken you'll need to replace it.
  • Roll out your backwash hose, if applicable, and turn the filter control valve to BACKWASH
  • Turn the filter pump back ON and pump out dirty water until the water runs CLEAR, then turn off the pump.
  • Set the control valve to RINSE and turn the pump on for about 10 seconds. Turn off the pump. This will get rid of any loose debris or pool filter media that may be in the lines or pool filter system.
  • Turn off pump, turn valve back to FILTER and you're done.

The entire process should take about 5 minutes, a little more for commercial sand filters.

Pool sand filter maintenance is just easy pool maintenance. A swimming pool sand filter is pretty bullet-proof if you take care of it.

Swim and have fun. 

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What Other Visitors Have Said

Click below to see contributions from other visitors to this page...

Water Discharges To Discharge Hose While In Filter Position 
When I run the filter in the filter position, a small amount of water continues to run out of the discharge hose. Normally when it was in the filter position …

Noisy Sand Filter & Motor Sand Coming Out Waste Line in Backwash 
First of all THANK YOU for your website. It has been a huge help to me! Opening pool this spring and as usual, some issue comes up, but this one has …

Multiport Vavle Stuck Backwash Mode & Air In Sand Filter  
Rotating the handle clockwise, it will not go back to filter mode. Do I need to remove the top of the valve and reposition the port? Thanks …

No Water Flow Through Glass Sight Gauge On My Filter System 
Under normal operation there is no water flow thru the glass sight gauge on my filter system. When I backwash I get the flow. When I place it back to filter …

Water Out Of Backwash Pipe & Jacuzzi Sand Filter Standpipe-Side Leaking 
Just changed the sand in my filter. Everything looks ok. I did the backwash for a couple of min. then put the multi-port selector to filter and water …

Swimming Pool Sand Filter..Pool Seems To Be Manufacturing Small Debris 
Dirt Going Back Into The Pool... To fix the problem, I replaced the 20 year old Hatward filter with a new Hayward filter. I put in new silica sand and …

Question About Swimming Pool Sand Filter 
I am helping my friend with her pool. She has a Jacuzzi Laser 190L swimming pool sand filter and sand continues to return to her pool. We replaced the …

Sand Filtration vs Glass Filtration Not rated yet
I have a 36x20ft pool that I have just resurfaced and 2 consults said my cartridge filter was too small from previous owners. Just getting into taking …

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Here goes my annual routine of maintenance on my sand filter. You will need: 1. Shop Vac 2. Cork that fits the diameter of the piping 3. Duct …

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Can you put DE into a sand filter? I've been told it helps to filter better. I am having trouble getting the water cleared up. The sand was new …

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