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Thread: Sand filter being bypassed

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    Sand filter being bypassed

    Hello all and thanks for the help in advance. My problem is cloudy water. The water tests o.k. and is just cloudy not green, brown or yellow. I figured it was time to change the sand so I did that as specified by the filter manufacturer. I found that my 200# filter only had about fifty pounds of sand in it. It did not blow in the pool nor is it covering my lawn where I have been pumping the backwash or wastewater. I don't think the pool builder ever put it in and we didn't notice because our first season with the pool was too short to see a problem. The inside of the filter was very sticky as of old grease and oil having been in water too long. Surprise! Anyway I cleaned everything and re-assembled the filter with the appropriate amount of new sand. The laterals looked good so I did not replace any. The problem I have now is that with the valve in the filter position it appears to be bypassing the sand bed (recirculating). I am fairly sure I got it all put back together correctly with the appropriate type and amount of sand. The pressure gauge reads 20# and does not change regardless of valve position or amount of time on the filter setting. There is no air in the pump basket and no air in any of the return lines. There is no sand in the pool or backwash water either. There are no leaks anywhere that I can see. The valve is the obsolete WC112-148. I have ordered the replacement 261186 valve other than try to rebuild the old one. Am I missing something? I don't want to throw money at it and end up with a cloudy pool in the end.
    12x24 steel wall vinyl liner inground
    Hopper bottom 3' - 6' depth
    Starite T200-BP sand filter
    1 HP Pentair Superflo pump
    Chlorinated pool

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    Mod Squad JohnT's Avatar
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    Re: Sand filter being bypassed

    Does your pressure gauge go to zero when the pump is off?
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: Sand filter being bypassed

    Pressure drops to zero immediately after shutting off the pump.
    12x24 steel wall vinyl liner inground
    Hopper bottom 3' - 6' depth
    Starite T200-BP sand filter
    1 HP Pentair Superflo pump
    Chlorinated pool

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    duraleigh's Avatar
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    Re: Sand filter being bypassed

    This is a multiport valve and not a push-pull is that correct?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad Bama Rambler's Avatar
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    Re: Sand filter being bypassed

    How did you figure out that it's bypassing all the time?

    When you put the valve on recirc the pressure should go down some. You've taken the sand out of the equation. There will still be some valve restriction but it should be less than the sand.

    If it truly is bypassing, then fixing that will definitely help the cloudiness issue.
    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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    Re: Sand filter being bypassed

    It is a multiport valve. I figured it was bypassing the filter because anything that goes into the skimmer seems to return to the pool (while the valve is set to filter). I put some chlorine granules in the skimmer and they went straight on through. I don't think that should have happened as the granules should have been trapped by the sand and thus raise the tank pressure. The pressure is 19-20# whether it is set to filter or recirculate. The only difference is that the needle seems to vibrate a little more while on recirculate (I might note that it is a new gauge). Why? I don't know other than the flow through the valve might be a little higher on recirculate even though the pressure stays about the same.
    12x24 steel wall vinyl liner inground
    Hopper bottom 3' - 6' depth
    Starite T200-BP sand filter
    1 HP Pentair Superflo pump
    Chlorinated pool

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    Mod Squad Bama Rambler's Avatar
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    Re: Sand filter being bypassed

    I think the valve is your problem. Once you have the replacement in I think you'll see a big difference.
    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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    Join Date
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    Re: Sand filter being bypassed

    Thanks for the most marvelous tip JFtheGR8! I am having issues with mine and and I tried it and as soon as I put stabilizer in, out it came through the return. Now to figure out why and fix it.
    Vinyl 18x36 inground pool, cart 4030 filter, tristar VS pool pump, T-15 SWCG, raised pre-plumbed fiberglass spillover spa w/12 jets, tristar VS spa pump, Aqualogic pl-plus-16v
    McDonough (Ola), Georgia

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    Re: Sand filter being bypassed

    I have read that the spider gasket is usually the culprit. My multiport is obsolete for a reason so I opted to just replace it altogether and not mess with trying to rebuild something that obviously is flawed to begin with. I should have the new valve by friday. I will post the results of replacing it.
    12x24 steel wall vinyl liner inground
    Hopper bottom 3' - 6' depth
    Starite T200-BP sand filter
    1 HP Pentair Superflo pump
    Chlorinated pool

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    Join Date
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    McDonough, GA
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    91

    Re: Sand filter being bypassed

    JFtheGR8, I had my filter plumbed backwards causing mine to bypass the filter.
    Vinyl 18x36 inground pool, cart 4030 filter, tristar VS pool pump, T-15 SWCG, raised pre-plumbed fiberglass spillover spa w/12 jets, tristar VS spa pump, Aqualogic pl-plus-16v
    McDonough (Ola), Georgia

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    Re: Sand filter being bypassed

    The valve was the problem. Water was clear within hours of changing it.
    12x24 steel wall vinyl liner inground
    Hopper bottom 3' - 6' depth
    Starite T200-BP sand filter
    1 HP Pentair Superflo pump
    Chlorinated pool

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