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Thread: Removing stuck multiport from filter housing?

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    JesseWV's Avatar
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    Removing stuck multiport from filter housing?

    Today after being unsatisfied with filter performance I decided to check the sand level in the filter. Unfortunately I could not get the multiport valve to unscrew from the top of the filter. I first tried counter clockwise but it would not budge one bit. I was putting so much force on it I was worried I was going to break the port openings off. I even tried counter clockwise a few times but still no movement whatsoever.



    As you can see my filter housing is also two pieces that are bolted together. Am I doing this properly? Is the multiport perhaps glued in and the filter needs to be opened by unbolting the two halves? That seems like it would cause sand to go everwhere.
    16k gal, 28'x3.5', Vinyl A/G, 1hp Pentair Dynamo 2-speed Pump, Hayward S160T Sand Filter, Intermatic HB800RCL Digital Timer, Intex 8110 SWG, TF-100 Test Kit, SpeedStir Author: Jesse's Graphical Pool Testing Log

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    Mod Squad Bama Rambler's Avatar
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    Re: Removing stuck multiport from filter housing?

    I've never taken one of those apart but I wouldn't think you'd need to take the body apart to service it.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    JasonLion's Avatar
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    Re: Removing stuck multiport from filter housing?

    Sand filters are usually only half full of sand. Sand filters need about one foot of space above the sand for free water flow for everything to work correctly.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    JesseWV's Avatar
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    Re: Removing stuck multiport from filter housing?

    Well it's a good thing I decided to take the filter apart. The long PVC pipe that runs down to the laterals and up to the multiport had the top halfway broken off right where it enters the multiport.

    Parts of the top of the sand were covered about 1/2" of caked dirt. I ended up scooping all of the sand out and washing it in a large kiddie pool with a hose. I had to cut the pipe clean, attach a high pressure coupling, a new piece of PVC, prime and glue. It took some work to get the length just right. Everything went back together nicely. I took the opportunity to apply new teflon pipe tape to all the fittings.

    When I restarted the pump I had it on the backwash setting for a minute, rinsed, and then got the same 12psi I always have on the filter setting. I'm really hoping the pressure starts to rise soon which would tell me it's actually filtering.

    I was so busy trying to get this fixed before I lost daylight I didn't take any pictures. However the top of the pipe was half gone leaving at least a 1" hole for water to be sucked through from the very top instead of from the bottom. Water takes the path of least resistance so it couldn't have been drawing much from the bottom of the sand pile.

    All I can think of is all the electricity I've wasted running my pump on what has been essentially "Recirculate."
    16k gal, 28'x3.5', Vinyl A/G, 1hp Pentair Dynamo 2-speed Pump, Hayward S160T Sand Filter, Intermatic HB800RCL Digital Timer, Intex 8110 SWG, TF-100 Test Kit, SpeedStir Author: Jesse's Graphical Pool Testing Log

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    JesseWV's Avatar
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    Re: Removing stuck multiport from filter housing?

    Quote Originally Posted by JasonLion
    Sand filters are usually only half full of sand. Sand filters need about one foot of space above the sand for free water flow for everything to work correctly.
    It surely was only full of sand to the top of the bottom half.
    16k gal, 28'x3.5', Vinyl A/G, 1hp Pentair Dynamo 2-speed Pump, Hayward S160T Sand Filter, Intermatic HB800RCL Digital Timer, Intex 8110 SWG, TF-100 Test Kit, SpeedStir Author: Jesse's Graphical Pool Testing Log

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    Mod Squad Bama Rambler's Avatar
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    Re: Removing stuck multiport from filter housing?

    Glad you got it apart and found the problem and fixed it.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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