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Thread: Which port is skimmer and which is drain?

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    Which port is skimmer and which is drain?

    First, this forum is truly a godsend. I just re-opened my inground after not opening it last year, and this board has already helped me find a hugely stupid mistake on my part. Thanks to everyone for their posts - just reading over the last several days has given me a tremendous education.

    My story (and very dumb question) quickly - the pool was put in a number of years ago (probably 20+) by the original owner of the house, and I've opened it every year (except last year) for the nine years I've lived here. The valve that feeds the pump is, I assume, the original one which is an old white plastic job. It has a line that's coming in at the 9 o'clock position - which has an old sticker that says 'Port A' - and a line that's coming in at the 3 o'clock position, that has a worn-away sticker that I assume was 'Port B'. There used to be markings on the valve in permanent marker that I think said 'full' and '1/2', meaning - again I assume - full skimmer and half skimmer/half drain. The markings have faded away over the years and I've actually forgotten which is the skimmer line and which is the split line. When I switch the valve to either of the two sides I can see draw in the skimmer. My hugely naive question: is there a convention or installation standard that says Port A is usually 100% skimmer? I know I should have this committed to memory, but amazingly enough I've forgotten which side is which. Any help greatly appreciated - and scolding expected...

    JM

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    Re: Which port is skimmer and which is drain?

    turn to full port A and then check on your skimmer, if it sucking a lot then port A is your skimmer; if it seems like it is off then port A is your maindrain.
    -Kevin
    X-Pert Pool Service
    x-pertpool.com
    X-Pert Pool on Facebook and @XPertPoolServic on Twitter
    22,000 gal / 16' x 32' / Vinyl / Hayward s244t /Pentair SuperFlo 1 hp

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    Join Date
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    Coastalish 'down easter'
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    Re: Which port is skimmer and which is drain?

    Welcome to TFP!!

    We love to hear that we've helped (and pictures!)

    You said that the skimmer seems to draw in either full A or full B - the valve is probably bypassing a little However, you should be able to notice a big difference in the amount drawn from one position to the other.
    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!)

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    Re: Which port is skimmer and which is drain?

    Thanks x-pert and waste - think I have it straight now. 'A' is skimmer and 'B' is split. I don't think there's a 'main only', as the 12 o'clock position seems to be 'off' and the 6 o'clock position seems to be 'off' as well. Don't know if that's strange, or normal for super-old valve, or if I'm just plain wrong....

    Waste - agreed that there may be some bypassing going on in the valve. I'm thinking that maybe (when I close the pool?) I can pick up a replacement valve and put it in - doesn't look like too tough a job.

    Thanks again for everyone's help, and I will post up some pictures next time, once I get this bad boy sparkling clean...

    JM

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

    Re: Which port is skimmer and which is drain?

    Glad you got the valve figured out

    Changing the valve once you close the pool is a good idea (I'd suggest a Jandy NeverLube 3 way valve ) If you can give me a pic of the existing valve and attached plumbing, I'll write you up a shopping list of materials you'll need and give you step by step advice on making the changeout

    Again, welcome to TFP!!
    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!)

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