How to replace a pool filter multiport valve

WRITTEN BY:  Inyo Pools

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The Multiport Valve on your filter could be called the command center, from this one piece you can have your filter complete six to seven different functions. For example Normal Filtration, Backwash and Rinse. Without a properly working valve your filter would be unable to function properly. In this guide we will walk you through on how to replace a damaged or old Multiport Valve.

Things You'll Need

Step by Step

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Step 1

First, before disassembling your filter or changing the valve lever position turn off your pool pump to prevent any excessive water loss or safety hazards. Now that your water is no longer circulating through your filter system, switch your valve to the "Closed" position.

Step 2

Before disassembling the body of your filter you will want to drain the system of its water. Locate the drain plug for your D.E. filter it will be on the lower portion of the filter. In our model it is located here. Wait until the pool filter has completely drained before moving forward.

Step 3

To be able to remove the multiport valve from the filter body you must first remove it from the plumbing lines of the pool to do this you will need PVC cutters. Cut the inlet and outlet pipe PVC Cutter for up 2" pipe part #: 99-362-1050

Step 4

When cutting the pipe you will want to leave enough room between the cut and the port of the valve for a coupler. This gap will be important when installing the new valve into the line. A gap no bigger that six inches on the inlet and outlet will be sufficient.

Step 5

Once the plumbing has been cut to the valve the next step will be unscrewing the unions that connect the valve to the filter. The unions on a Sidemount valve will look like this

Step 6

In cases in which you have a Top Mount Valve after disconnecting the plumbing lines you will need to unscrew the valve or unfasten the clamp depending on your style of filter.

Step 7

When the unions are finally unscrewed your valve can pulled off the filter's valve ports. Discard old multiport valve at this time.

Step 8

Now onto install your new Filter Multiport Valve.

Step 9

First thing to do will be to connect the union connections to the filter body. This will create a stable platform for when you perform the replumbing later.

Comments

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(1 to 8 of 8)

Daphne  Posted: 10/10/2018 

Hi I took screws off multiport valve to put in new spider gasket and can’t remeber how to place back and which position. Is there anyway you can tell which way it goes back. I wouldn’t want to replace it wrongly and maybe backwash instead of filter. Help please
 Reply

InyoPools Product Specialist Matt S.  Posted: 10/10/2018 

Hello Daphne - There is usually a notch or some sort of marker on the valve cover and the valve body that has to be aligned to ensure you are placing the cover in the correct position. We show in step 22 of this guide: How to Replace a Hayward Key Seal Assembly
 Reply

InyoPools Product Specialist Dennis R.  Posted: 8/30/2017 

6qlD4v.. - Thank you for your comment. It looks like this guide was started and inadvertently put on the website before it was finished, then forgotten. See our guide on "How To Install a Pool Sand Filter" for some of this information. We will put this guide back into the hopper to be finished at a later date.
 Reply

6qlD4vJW+UQHmTmL/uzW6QxUrCO9B/wTlqlvoSmx4dA=  Posted: 8/29/2017 

Where are the rest of the steps? I just see up to step 9 and then it ends....no second page, etc. Is something wrong with the webpage?
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InyoPools Product Specialist Dennis R.  Posted: 6/21/2016 

kim - There is a bearing washer under the handle that may be cracked or the valve spring may be weak and need to be replaced.. See our guide on "How To Replace a Pool Multiport Valve Spring".
 Reply

kim  Posted: 6/20/2016 

i have an american products filter and multiport valve circa 1995
the filter still works well but the handle on the multiport is hard to turn
is there a solution for that?
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InyoPools Product Specialist Dennis R.  Posted: 5/9/2014 

Check the manufacturer of the filter to see if you have a screw on Multiport Valve. If it is a screw on and both the MPV and the filter tank are plastic, try soaking the joint with a TSP solution. Then attach a strap clamp around the bottom of the MPT and twist it counter-clockwise. Have someone tap the joint gently with a rubber hammer as you are twisting it. Hopefully, this MTV was not glued on to the filter tank.
 Reply

Anonymous  Posted: 5/9/2014 

In step #6 (my top mount does not have the clamp part), I can not unscrew it from the body. I even tried using WD-40 several times letting it alone to soak in to help loosen it as my pool supplier suggested. I even used a piece of wood with a hammer to try to nudge it. It does not budge.
Any more suggestions?
PLEASE REPLY !!!
 Reply