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Gasket on hayward 712-2 is slightly warped water comes out of backwash at same time filter is running. need new gasket. temp fix of raising the seat of broken spoke not working. filter runs fine if valve turned to WASTE . can,t tell the difference . what is different about running filter on waste. obviously doesn't sound good but i'm going out of town for 3 days.

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  • Samuel Charles Spriggs May 11, 2010

    Is your waste output port on the multi-port valve plugged?



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Buy a new gasket and install with some sort of gasket lube.
Selector (rotary) valve operation: Do not move selector valve unless pump is off, and always move in a clockwise direction.
'Waste' selection bypasses filter completely and sends water directly out of pool backwash port

Posted on Aug 23, 2009


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The spider gasket did not seat properly!
Take it apart and try again.
get the inside of the valve body completely dry, and make sure the grooves in which the gasket seats, are completely cleaned and free of any old sealant or gasket material.
Then apply a little bit of Silicone sealant, not much, into that groove. Then reassemble. Do NOT turn pump on for at least 8 hours to provide time for the silicone to cure, then try it.
Hopefully this helps you.
Good Luck.

Apr 28, 2015 | Hayward SAND FILTER, PRO SERIES

1 Answer

How to get the right pressure to backwash and rinse

you dont need a lot of pressure to backwash just make sure water is clean coming out then rinse for 30 sec then put back on filter do not turn valve while filter is running you will ruin multiport gasket

Jul 18, 2014 | Hayward SAND FILTER, PRO SERIES

1 Answer

When the pool filter is back on run why does water still comes out of the backwash pipe?

bad mutiport spider gasket plug the backwash for now so you can run the filter

Jun 04, 2014 | Hayward SAND FILTER, PRO SERIES

1 Answer

I have a hayward sand filter pro series and for some reason the water from the pool keeps draining I need to know if the switch at the top is at the right direction

check to see if water coming out of backwash valve while if filter position bad multiport gasket you can put a valve on it and close when not backwashing

May 20, 2014 | Hayward SAND FILTER, PRO SERIES

1 Answer

My pool won't run on backwash

A new Multivalve gasket (Or Cam) may be needed. you will need to disassemble the Multivalve.

Jul 23, 2012 | Hayward SAND FILTER, PRO SERIES

1 Answer

Pool filter backwashes on all settings

Time for either a new Multivalve Gasket or possibly Cam. You will need to Disassemble.

Jul 09, 2012 | Hayward SAND FILTER, PRO SERIES

1 Answer

When I was moving the handle to backwash I couldn't hardly move it and after I moved it back to filtration position the water wouldn't stop running through the drain hose.

This problem occurs when the "spider" gasket inside the multiport valve fails. This repair can be done by a homeowner but requires a few things. 2 c-clamps, the new spider gasket, and chlorine safe adhesive/caulk to seat the gasket.

I dont know what model multi-port valve you have as there are 3 model that fit on this filter. Here is the link to haywards manual site where you can find a manual on your filter, and your valve that will list instructions and part numbers.

Hope this helps

Mar 30, 2011 | Hayward SAND FILTER, PRO SERIES

1 Answer

Wicor high rate sand filter P20. When I have it on "filter" there seems to be some water starting to leak from "backwash" hose.I only let it run maybe 30 seconds. Not looking for it to blow out any seals...

If it has a multiport valve, most likely the spider gasket inside has damage or has come out of place. A broken stem spring can also cause water to bypass out the backwash due to not having enough force to seat the seal. Take the multiport apart and check the spider gasket and spring.

Aug 15, 2010 | Hayward SAND FILTER, PRO SERIES

1 Answer

Water is coming out of backwash hose while in filter mode?

The gasket inside the valve is likely rolled out of place allowing water out of the backwash port. It may be salvagable if you reseat it. Otherwise it will need to be replaced.

Jun 10, 2009 | Hayward Pro Series 18" Above Ground Pool...

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