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Thread: Plugged main drain and SWG

  1. Back To Top    #1

    Join Date
    Jun 2009
    Location
    Houston, Tx
    Posts
    29

    Plugged main drain and SWG

    My pool runs fine, but to day I discovered my main drain doesn't pull any water.

    I don't have separate skimmer/main drain control, just pool/spa valves. If I cut off the spas drain, it seems only the pool skimmers(2) will suck water until they are faster than the water coming into them. At that point the cartridge filters pressure will plummet to 0 and there will be a little air coming into the pump. Switch the valve back to both and I guess the spas main drain opens up and the filter pressure returns.

    Anyway! I'm aware that not having a main drain is not a huge deal. But my concern is this: I'm converting to salt water, will the circulation be enough to move the salt water around efficiently?
    I have 3 returns in the deep end(3 in the shallow), if get some directional jets for the deep end returns to blow downwards will that be enough?

    Thanks!
    In Ground gunite pool
    26,700 gallons, Hayward Super 2 pump, Hayward booster pump
    Hayward Super 2 fall/ fountain pump
    Cartridge filter, Polaris 280 pool cleaner

  2. Back To Top    #2

    Join Date
    Jun 2009
    Location
    Houston, Tx
    Posts
    29

    Plugged main drain and SWG

    I put this in the Pumping Station section but maybe here is better.
    Topics merged. Please only ask questions in one place. Thanks JasonLion

    I just realized today that my main drains don't have suction. I don't have seperate skimmer/main valves, just pool/spa valves. I turned the valve completely to pool and when the skimmers catch up to the water, the filter psi slowly starts to sink to 0. Once I open up the spa main drain it all returns to normal.

    So, no main drain. I guess that's ok. But I'm switching to SWG and dumped the salt in. I'm just curious if the water will circulate enough with just the skimmers. Should I get some return jets for the deep end returns to angle the water down and help mix things up?

    Thoughts? Thanks!
    In Ground gunite pool
    26,700 gallons, Hayward Super 2 pump, Hayward booster pump
    Hayward Super 2 fall/ fountain pump
    Cartridge filter, Polaris 280 pool cleaner

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: Plugged main drain and SWG

    You should aim one return down towards the bottom of the deep end, just to make sure you are getting good mixing at all depths.

    Check your skimmer(s) underneath the skimmer basket and see if there are two pipes instead of one. If you have a skimmer with two pipes in it, the main drain is plumbed to the skimmer.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  4. Back To Top    #4

    Join Date
    Jun 2009
    Location
    Houston, Tx
    Posts
    29

    Re: Plugged main drain and SWG

    I see. There is two pipes in the skimmer at the deep end. So in theory, I could use my vacuuming hose to connect the two pipes to see if the main drain in not clogged, yes?

    I will adust two of the three returns to shoot down. Thanks for the tips!
    In Ground gunite pool
    26,700 gallons, Hayward Super 2 pump, Hayward booster pump
    Hayward Super 2 fall/ fountain pump
    Cartridge filter, Polaris 280 pool cleaner

  5. Back To Top    #5

    Join Date
    Mar 2007
    Location
    Coastalish 'down easter'
    Posts
    4,160

    Re: Plugged main drain and SWG

    Salt isn't your problem, and won't be

    I believe that the skimmer closest to the deep end has 2 ports to make the MD work via that skimmer

    I can tell you more, when I know more about your pool
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

  6. Back To Top    #6

    Join Date
    Jun 2009
    Location
    Houston, Tx
    Posts
    29

    Re: Plugged main drain and SWG

    Well, I think the salt question was cleared up for me
    What would you like to know?
    In Ground gunite pool
    26,700 gallons, Hayward Super 2 pump, Hayward booster pump
    Hayward Super 2 fall/ fountain pump
    Cartridge filter, Polaris 280 pool cleaner

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