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Thread: Losing prime when filtering

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    Losing prime when filtering

    So I just added a V-green 165 VS pump to my system after my pump motor locked up on me. I had to replumb the pump housing and motor because the new motor wouldn't fit with the old configuration. After the replumb and changing out the shaft seal and all o rings, I can get the pump to prime when the multi port valve is set to filter. Oddly, it primes and works perfectly if the valve is set to recirculate. FYI, I also changed the spider gasket in the multi port valve. I'm lost. Why would everything work properly when set to recirculate but not when filtering? Help!
    21k Gal, IG Vinyl, Sand Filter w/ Multiport Valve, CircuPool RJ30 Digital SWG, Jacuzzi Cygnet II w/ V Green 165 VS Pump Motor, Polaris 280 Automatic Pool Cleaner w/ Booster Pump

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    n240sxguy's Avatar
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    Re: Losing prime when filtering

    This may be a dumb question, but did you put the top of the valve back in exactly the same position? Other than that, I'm not sure. Have you checked the other settings? Like backwash, closed, rinse, to make sure they work as they should?


    30K gallon IG vinyl. 1.5HP 2-speed Waterway Mustang pump. 600 lb sand filter. Polaris 280. Circupool SI-60+. TF-100

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    Re: Losing prime when filtering

    Yes I put the valve back in the same position. Backwash and recirculate work fine. It's only when valve is moved to filter that I have a problem. If there was an air leak, I would think it would effect every setting.

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    Mod Squad JohnT's Avatar
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    Re: Losing prime when filtering

    Have you verified that water is being pulled into the skimmer and discharging through the returns when set to recirculate?
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  5. Back To Top    #5

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    Re: Losing prime when filtering

    Yes the water moves freely when set to recirculate. The pump basket is full with no air bubbles. The SWG is full with no air bubbles and the jets are rolling. A minute or so after switching to filter I get air in the line and lose prime. The water sits about an inch below the pump basket lid and only fills halfway up the SWG. It still flows through the returns but I'm obviously pulling air from somewhere.

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    Re: Losing prime when filtering

    Have you backwashed recently? When my sand filter gets dirty my first indication sometimes is a half full pump basket. After I backwash and rinse, the pump basket is full again when set to filter. Hows PSI?
    25K inground gunite with raised spa. Full Pentair products - Mastertemp 300 Gas Heater , IntelliBrite 5G Pool Lights (2), 1X Spa LED Light, VS Intelliflo Pump, Intellichlor SWG, 2 waterfalls and bubblers w/ seperate pump, sunshelf

  7. Back To Top    #7

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    Re: Losing prime when filtering

    I did backwash a few days ago. My PSI normally runs about 10 or so. Currently, it's in the 15-17 range. I am in the middle of turning the pool from the winter swamp back into a backyard oasis. I will give that a try later today and see if that helps any.

  8. Back To Top    #8
    Mod Squad JohnT's Avatar
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    Re: Losing prime when filtering

    Quote Originally Posted by MSUFAN10 View Post
    Yes the water moves freely when set to recirculate. The pump basket is full with no air bubbles. The SWG is full with no air bubbles and the jets are rolling. A minute or so after switching to filter I get air in the line and lose prime. The water sits about an inch below the pump basket lid and only fills halfway up the SWG. It still flows through the returns but I'm obviously pulling air from somewhere.
    What does the pressure gauge show during this process? Does it spike before the prime loss?
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  9. Back To Top    #9

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    Re: Losing prime when filtering

    Not sure about that. I haven't watched the pressure gauge during the process. I will have to check when I go home for lunch.

  10. Back To Top    #10

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    Re: Losing prime when filtering

    So I went home and switched the valve from recirculate to filter. Some of the water from the SWG drained out while turning the valve but the pump basket stayed full. Switched the pump back on and the pump basket stayed primed but the SWG never filled back up. It got about 3/4 the way full and stayed there. The pressure never changed. It stayed around 15 PSI. There has to be something going on inside the sand filter right?

  11. Back To Top    #11

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    Re: Losing prime when filtering

    After running for a few hours the skimmer basket now has a big air bubble and the SWG is only half way full.

  12. Back To Top    #12

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    Re: Losing prime when filtering

    Problem fixed! Thank you bongardjm. Backwashed for 5 minutes, rinsed, set to filter and like magic I have a fully primed pump. I love the easy fixes.

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