Question about Hayward SAND FILTER, PRO SERIES

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Changed sand now the multiport valve is leaking at very top?

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Is it leaking at the joint between the tank and valve, between the two halves of the valve, or from the center of the valve (around the handle)? If It's either of the first two, you may need to replace the o-ring. Take it apart, and check to make sure the o-ring is in good shape, and seated properly. If the o-ring is flat, oblong, or leaving black on your hands, then you should replace it. If it is leaking around the center of the handle, then you need to replace the o-ring and/or teflon seal on the shaft of the stem assembly (the part the handle connects to. To get to this you need remove the top half the valve, then drive out the pin that holds the handle on. (make a not with direction the handle and the stem are. otherwise you can be 180 degrees of when you put it back together. Hope this helps. If you need further assistance post a reply in the comments, and don't hesitate to leave a good thumb rating if you found this helpful. Thanks, and good Luck!

Posted on Oct 03, 2010

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This could be caused by several things. . After back flushing,did you rinse? Turned pump off, moved selector to rinse, and allowed to run until clear water was observed in the sight glass? If you continue to see the plume of particles, and it never stops, then you probably do have a problem. Your multiport valve gasket could be leaking by. Be sure you keep handle down when moving valve, and the gasket will last longer. You may have a broken, lateral (little fingers at bottom of the filter return piping. This would usually allow sand to flush out of the filter and it would be all the time. The "O" ring where the multiport valve seals to the down pipe could be leaking, letting the dirty incoming water mix with clean outgoing. Have you "cleaned" your filter lately? This is where you add a chemical to flush materials from top of sand pack? You can download a manual with troubleshooting instructions from www.haywardnet.com Enter your exact model number

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A cloudy plume of fine particles is discharged into the pool after backflushing and rinsing. I was told this is indicative of a filter problem related to the sand or a broken piece in the filter core.


It depends on several things. After back flushing, you said you did rinse? Turned pump off, moved selector to rinse, and allowed to run until clear water was observed in the sight glass? If you continue to see the plume of particles, and it never stops, then you probably do have a problem. Your multiport valve gasket could be leaking by. Be sure you keep handle down when moving valve, and the gasket will last longer. You may have a broken, lateral (little fingers at bottom of the filter return piping. This would usually allow sand to flush out of the filter and it would be all the time. The "O" ring where the multiport valve seals to the down pipe could be leaking, letting the dirty incoming water mix with clean outgoing. Have you "cleaned" your filter lately? This is where you add a chemical to flush materials from top of sand pack? You can download a manual with troubleshooting instructions from www.haywardnet.com Enter your exact model number

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What do you mean by head? The black multiport valve? Where exactly is it leaking? You may be able to fix with new o-ring or seal. Otherwise you'll have to replace the top half or possible the whole valve

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I'm having a problem with my Hayward multiport valve. Until recently when I changed the sand in the filter, it was working fine. Now that I've changed the sand and cleaned the valve, the valve is not...


If you just removed the multiport valve to do the sand change and did not take it apart, there should not be any problems. You may need to take the multiport valve apart to see that the spider gasket is in place. Also, if you did not fill the tank with water up to the level of the laterals at the bottom before adding sand, you may have broken a lateral and it's allowing sand to return to the pool. I would check the spider gasket first. Also check the spring and stem to make sure that it is actually changing positions inside.

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If you remove the top of the valve you will see a spider gasket that has pulled out of place. remove this and clean and dry throughly. Add a small amount of silicone sealer to the bottom of a new one and install in groves then replace top of valve and let sit for a couple of hours. That should fix. If not you will need to replace the top half of the valve also.

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There should be a rubber "O" ring in there. Check for that

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Either you have a bad spider gasket inside the multiport valve or a bad threaded fitting going into it. Check for leaks around the multiport and backwash line. You'll have to take apart the multiport valve to make sure the spider gasket is not damaged or out of place. Make sure to install the multiport valve in the same position. You can get a replacement gasket at most pool supply stores or online.

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