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Thread: Pump & Filter questions!

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    Question Pump & Filter questions!

    I'm on my 3rd season of owning my pool (estimated build around 1999). Last year I discovered adding DE to my sand filter greatly improved its filtering ability, went from kinda clear to crystal clear with the addition of DE. This year when opening it the water just wouldn't get anywhere near clear without using the DE, so I opened up the filter and rinsed it out and didn't really get much gunk out so I'm contemplating replacing the same to start new. I know many people on these forums say you really should never need to replace the sand but in my case I think it would be beneficial.

    On to the questions..

    1.) I have a slide valve currently and it seems about every year I have to replace the O-rings on this thing. Every spring I check them, clean off and add lube and reinstall. The bottom O-ring on the slide valve is always stretched out and sometimes torn. It doesn't get used very often due to not having to backwash regularly (maybe once or twice a season if that). I've read that most if not everyone recommends a multi-port valve over a slide valve. Would this be a good idea for my situation? I'm not really sure why the O-ring keeps tearing or wearing out, so I'm not sure if there’s something else causing it or if its normal operation for these slide valves. One more point to add is that the way my backwash line is plumbed is goes into what I would call a pit next to the pool equipment and just goes back into the ground (no backwash hose or anything). For this reason I have no idea of the water coming out of the backwash line is clean or not because its being pumped into dirt and just filling up this "pit".

    2.) When opening my pump basket the water immediately goes down and starts a sucking sound, to me this doesn't sound right but I'm still a newbie at this. Does this sucking indicate a leak somewhere?

    adding pics below so you have a better understanding of my setup.



    The metal box mounted on the wall on the right is an old Oxidizer that was already disconnected when we purchased the house.


    My "pit":


    This is where the water comes out, as you can see theres no way to tell if the water coming out is clear.
    PebbleTec | 25k Gallons | Purex Triton Whisperflo pump | Magnetek Century Centurion 1.5HP | Hayward Pro Series S311SX Sand Filter | Taylor K-2006 kit

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    Mod Squad jblizzle's Avatar
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    Re: Pump & Filter questions!

    1. Multi-valves are nice, not sure why you o-rings are always going bad. My backwash goes into a hole also, but the water flows away (not trapped like yours) and I can tell when it is clear. I wonder if you could plumb that backwash pipe to face up so that it bubbles up some allowing you to see the water color?

    2. Whenever you open up the system, the water is going to try to drain down to the pool water level, some noise is not unexpected.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    Re: Pump & Filter questions!

    Quote Originally Posted by jblizzle View Post
    1. Multi-valves are nice, not sure why you o-rings are always going bad. My backwash goes into a hole also, but the water flows away (not trapped like yours) and I can tell when it is clear. I wonder if you could plumb that backwash pipe to face up so that it bubbles up some allowing you to see the water color?

    2. Whenever you open up the system, the water is going to try to drain down to the pool water level, some noise is not unexpected.
    I wonder if turning it up would make that big of a difference though, since the pit fills up pretty quickly. When backwashing, the water mixes with the dirt pretty quickly and just looks like a mud pit during backwashing.
    PebbleTec | 25k Gallons | Purex Triton Whisperflo pump | Magnetek Century Centurion 1.5HP | Hayward Pro Series S311SX Sand Filter | Taylor K-2006 kit

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    Mod Squad jblizzle's Avatar
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    Re: Pump & Filter questions!

    I think you would still see the water bubbling in the middle ... or turn it up higher than the level of the wall. It should not really spray anywhere.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: Pump & Filter questions!

    I'm going to go ahead and purchase the Hayward SP0715XR50 Pro Series Vari-Flo Control Valve from Amazon, can anyone confirm that this is the correct valve for my Hayward Pro Series S311SX filter?

    I'm also thinking about picking up a Hayward SP1072S 1-1/2-Inch Slip In-Line Backwash Sight Glass, unless anyone thinks that's overkill. My local pool store sells it for $46 and its only $28 on Amazon.
    PebbleTec | 25k Gallons | Purex Triton Whisperflo pump | Magnetek Century Centurion 1.5HP | Hayward Pro Series S311SX Sand Filter | Taylor K-2006 kit

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    Mod Squad jblizzle's Avatar
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    Re: Pump & Filter questions!

    That valve is for DE filters, I think the plumbing is different.

    There is a site glass on the multi-valve already so do not see the point in the in-line one.

    - - - Updated - - -

    You want the SP710X62 (1.5") or SP715X62 (2") multi-valve.

    - - - Updated - - -

    Here is the manual for your filter where the parts are listed: https://www.hayward-pool.com/pdf/manuals/ProSeries-S311SX-S311SXV-S360SX.pdf
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: Pump & Filter questions!

    Thanks for your quick reply! I just ordered the correct valve, and even found it cheaper at another online store. I ended up paying $122 and the local pool store wanted $198!
    PebbleTec | 25k Gallons | Purex Triton Whisperflo pump | Magnetek Century Centurion 1.5HP | Hayward Pro Series S311SX Sand Filter | Taylor K-2006 kit

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