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Thread: Main drain off/Skimmer only = 5psi drop & bubbles

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    Main drain off/Skimmer only = 5psi drop & bubbles

    My plumbing is hooked up so that I can run part main drain and part skimmer, or 100% of either one. In order for my Creepy to operate properly, I have to shut the main drain completely and run all suction from the skimmer. When I do this, my pressure @ the filter drops about 5psi (compared to when I'm running 50/50 skimmer/main drain) and I get some air bubbles from returns. I also notice that my pump basket doesn't fill right up so there's lots of splashing going on in there. Now if I run 100% skimmer without the Creepy hooked up, I get a similar situation, but to a lesser extent ... about 3psi loss, less bubbles, and less splashing in pump basket. Is this "normal"? Do I need to look into anything? And yes, I'm running the Creepy with the proper suction valve, etc, etc, etc. I can take pictures of my plumbing if necessary.
    1) In-Ground pool with vinyl liner
    - ~25,000 gallons
    - Sand Filter
    - 1 HP pump
    - BBB method working perfectly since 2010
    2) Four Winds Honolulu Spa
    - ~450 gallons
    - 3 step bromine

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    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    SW Indiana

    Re: Main drain off/Skimmer only = 5psi drop & bubbles

    Most likely it's normal for your pool. Your plumbing can't supply enough water to the pump from just one line, so less is going out, hence the air and lower pressure.
    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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