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Thread: Which valves do i leave open during filtering?

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    Which valves do i leave open during filtering?

    I have 3 valves/pipes?
    They're labeled as Main Drain/ Shallow Skimmer/ Deep Skimmer.
    Which ones do i leave open/close when i am filtering/backwashing. Sorry if this is a dumb question, i'm still new to managing pools and slowly learning my way up.

    Thanks for any advice!

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    Richard320's Avatar
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    Re: Which valves do i leave open during filtering?

    All of them. You don't need much on the main drain. I would just open it a little bit until you just start to see a difference in the skimmer turbulence. Then you'll want to close off the closer skimmer a little bit until the flow looks equal inside the two of them.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Which valves do i leave open during filtering?

    Quote Originally Posted by Richard320 View Post
    All of them. You don't need much on the main drain. I would just open it a little bit until you just start to see a difference in the skimmer turbulence. Then you'll want to close off the closer skimmer a little bit until the flow looks equal inside the two of them.
    Thanks for the response. How would i be able to judge the flow between the two of them?

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    Richard320's Avatar
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    Re: Which valves do i leave open during filtering?

    Quote Originally Posted by IABO View Post
    Thanks for the response. How would i be able to judge the flow between the two of them?
    Look inside the skimmer well and try to match the turbulence. Aiming returns and balancing flows is more art than science. Just experiment.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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