Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 5 of 5

Thread: Restarting pump, wont create suction?

  1. Back To Top    #1
    seeclearly's Avatar
    Join Date
    Sep 2011
    Location
    WA state
    Posts
    24

    Restarting pump, wont create suction?

    Hi all,
    I'm replacing my liner for the first time ever, and have a bunch of water I need to get out of the pool. My aboveground has a main drain (as well as a dished bottom, so there is a lot of water). I should be able to get the pump running and backwash out the water using the main drain only, right?

    I have the skimmer valve shut, the main drain open, the pool return closed, the sand filter set to backwash. The pump turns on, the sand filter seems full of water. The pressure valve on the pump is registering quite high, but I don't necessarily trust it. I should perhaps go get a new pressure indicator to see if the condition is real. When I add water to the pump skimmer basket to bring it up to the level of the pump intake, the level lowers and doesn't prime the pump. I can only get the water up to that level by closing the main drain valve to get started, then opening quickly. I did briefly see pressure on the backwash end at that time, so I don't think the filter and backwash plumbing is the problem. Also the pool is 10 years old and it has worked so far so there's no reason for the plumbing to be "wrong" now.

    The water is silty but I have fished out any actual debris. I don't think there is a clog. I haven't seen any air bubbles coming up into the pool to prove it, though. The water is going Somewhere, and the pool is about the only place, unless there is a broken pipe under the pool, which seems unlikely.

    Any secrets I should know about? Suggestions?

    Eagerly awaiting your expert knowledge of fluid dynamics!
    TF-100 test kit. 24' round AG, unknown brand. Installed originally 2007. Dished deeper 1.5 feet in center w/main drain, 11500 gal. 3/4 hp Jandy pump runs 24/7, 30" Hayward sand filter, LP gas heater, oversized. Used to use a puck chlorinator, switching to liquid chlorine. Short swim season! Pool doesn't freeze in winter, water gets down to 42 degrees.

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Restarting pump, wont create suction?

    Above ground pumps are not usually self priming and are designed to be below the water level and automatically prime. Meaning if the valves were open and the lid of the pump was off, water should be pouring out.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  3. Back To Top    #3
    seeclearly's Avatar
    Join Date
    Sep 2011
    Location
    WA state
    Posts
    24

    Re: Restarting pump, wont create suction?

    It doesn't pour out, it drains away into the pool. (Normally it would pour out, seen by the washing of the skimmer window when in use) At its partially full state, the pump is above the water level. So then I'm guessing I can't get suction until the pool is full enough to get the pump below water level?

    In that case I'll just use a simple siphon.

    Thanks!
    TF-100 test kit. 24' round AG, unknown brand. Installed originally 2007. Dished deeper 1.5 feet in center w/main drain, 11500 gal. 3/4 hp Jandy pump runs 24/7, 30" Hayward sand filter, LP gas heater, oversized. Used to use a puck chlorinator, switching to liquid chlorine. Short swim season! Pool doesn't freeze in winter, water gets down to 42 degrees.

  4. Back To Top    #4
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Restarting pump, wont create suction?

    Quote Originally Posted by seeclearly View Post
    It doesn't pour out, it drains away into the pool. (Normally it would pour out, seen by the washing of the skimmer window when in use) At its partially full state, the pump is above the water level. So then I'm guessing I can't get suction until the pool is full enough to get the pump below water level?

    In that case I'll just use a simple siphon.

    Thanks!
    The pool vacuum hose will flow way more than a garden hose as a siphon.
    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!

  5. Back To Top    #5
    seeclearly's Avatar
    Join Date
    Sep 2011
    Location
    WA state
    Posts
    24

    Re: Restarting pump, wont create suction?

    Thanks for the help! Good tip on the vacuum hose.
    TF-100 test kit. 24' round AG, unknown brand. Installed originally 2007. Dished deeper 1.5 feet in center w/main drain, 11500 gal. 3/4 hp Jandy pump runs 24/7, 30" Hayward sand filter, LP gas heater, oversized. Used to use a puck chlorinator, switching to liquid chlorine. Short swim season! Pool doesn't freeze in winter, water gets down to 42 degrees.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •