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Thread: Air in the filtration system

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    Join Date
    Feb 2009
    Location
    North East Thailand
    Posts
    73

    Air in the filtration system

    Hello Everyone
    I have a problem with excessive air in the filtration system that is causing problems when trying to vacuum the bottom of the pool. It can take up to 20 minutes for the air to be syphoned off through surface bubbles before the vacuum works efficiently.
    I have a sand filter and water passes through it by using 4 valves. No' 1 and 4 are opened to use the vacuum. No' 2 and 4 are opened to filter the pool water, No's 3 and 4 are opened to top up the pool. Number 3 is opened to backwash.
    In the top of the pump there is an inspection glass that shows the strainer basket content and this is invariably low on water causing the pump to seem to labour until sufficient water is in the strainer to enable the pump to work efficiently with a good flow of water passing through it.
    Does anyone have any advise on how to get rid of the excessive air? I have checked the flexible vacuum hose for holes and can find none.
    Regards to all
    Mike
    Regards
    Mike Court
    In ground Pool size 12m x 5m x 1.3m av
    Concrete construction with tiled base and sides
    750 Sand Filter
    1.5k Pump
    I don't have a skimmer, around the perimeter of the pool is a plastic grate above a concrete channel that directs overflow into holding tank.

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    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    15,422

    Re: Air in the filtration system

    My pump can push water out faster than it can pull it in through the vacuum hose. So I get that same starvation thing in the filter basket and it gets noisy. I open the other valve and draw some water from the spa - just enough to keep the basket full. I haven't done it enough to know for sure yet if it sweeps better with 100% suction on the hose or 100% water in the basket, but the pump is certainly quieter.
    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: Air in the filtration system

    Try this , close vacume line and open the normal valves for water circulation, start pump. SLOWLY open vacume line and watch the water level in the pump strainer. you will see bubbles but not more than a min or 2 at the most. when the hose is primed your vacume hose should be laying on the pool floor not floating .
    If the air is not removed withing 2 to 3 min. you are likely sucking air from some place. If you are certian the hose has no leaks check the area where the hose connects to the piping, mine likes to suck air there so I have 2 clamps for that reason. When the vacume is sucking correctly set the valves to thier correct position.
    coloeb,
    20k gal. IG fiberglass/plaster rectangle 32'x16'
    Hayward Superpump 3/4 H.P. primary Hayward model 5060 Booster Pump
    Hayward Pro Series High Rate Sand Filter
    Pentair Model 320 automatic Chlorine/bromine in-line feeder

  4. Back To Top    #4

    Join Date
    Feb 2009
    Location
    North East Thailand
    Posts
    73

    Re: Air in the filtration system

    Quote Originally Posted by coloeb
    Try this , close vacume line and open the normal valves for water circulation, start pump. SLOWLY open vacume line and watch the water level in the pump strainer. you will see bubbles but not more than a min or 2 at the most. when the hose is primed your vacume hose should be laying on the pool floor not floating .
    If the air is not removed withing 2 to 3 min. you are likely sucking air from some place. If you are certian the hose has no leaks check the area where the hose connects to the piping, mine likes to suck air there so I have 2 clamps for that reason. When the vacume is sucking correctly set the valves to thier correct position.
    Hello Coloeb
    Thanks for the advice. My system has two valves for vacuuming and two valves for filtering. I have tried as you suggested with no immediate improvement. When you say slowly open the vaccuum line does that mean open both vacuum valves inlet and outlet through the filter?
    I did notice that air was leaking through the top of the strainer glass cover so may be I will buy a new rubber gasket.
    Thanks
    Mike
    Regards
    Mike Court
    In ground Pool size 12m x 5m x 1.3m av
    Concrete construction with tiled base and sides
    750 Sand Filter
    1.5k Pump
    I don't have a skimmer, around the perimeter of the pool is a plastic grate above a concrete channel that directs overflow into holding tank.

  5. Back To Top    #5

    Join Date
    Feb 2009
    Location
    North East Thailand
    Posts
    73

    Re: Air in the filtration system

    Quote Originally Posted by Richard320
    My pump can push water out faster than it can pull it in through the vacuum hose. So I get that same starvation thing in the filter basket and it gets noisy. I open the other valve and draw some water from the spa - just enough to keep the basket full. I haven't done it enough to know for sure yet if it sweeps better with 100% suction on the hose or 100% water in the basket, but the pump is certainly quieter.
    Hello Richard
    Thanks for the advice, it sounds as though we have the same problem, I am not sure which valve you think I should open as I have two for filtration and two for vacuum. 1 & 4 are for vacuum and 2 and 4 are for filtration, Valves 1 and 2 are the outlet valves from the pool to the filter.
    Thanks
    Mike
    Regards
    Mike Court
    In ground Pool size 12m x 5m x 1.3m av
    Concrete construction with tiled base and sides
    750 Sand Filter
    1.5k Pump
    I don't have a skimmer, around the perimeter of the pool is a plastic grate above a concrete channel that directs overflow into holding tank.

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