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Thread: blowing off skimmer lid

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    Join Date
    Jun 2013
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    blowing off skimmer lid

    When I turn off my pump the skimmer lid blows off with water coming out of it. My water has remained cloudy for three weeks and I cannot get it cleared up. Does the one problem have to do with the other. I have a 24,000 gallon in ground pool with a hayward S244T sand filter with a vinyl liner. I bought the sand filter in 2011 and when they installed it the hooked it up backwards. I had trouble with my water being cloudy all last year and could not get it cleared up. Same problem this year. I replaced the sand and checked the laterals. Everything was fine. I do not have a relief valve. I have put a quart of algaecide and 10 bags of super pool shock with 4 gallons of liquid shock. Also, 1/2 bottle of super fall out and my water is still greenish blue and cloudy. Can you help me with either problem. I have not tried to recirculate to see if the skimmer lid still blows off. Any help would be great!

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    Mod Squad JohnT's Avatar
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    Re: blowing off skimmer lid

    Welcome to TFP!

    Your skimmer lid is coming off because you have an air leak and the filter is getting air in it. As the pump operates it compresses the air in the filter. When you shut the pump off, the air expands and pushes water out through the skimmer. Check your pump basket lid O-ring and the O-ring on the pump basket housing drain for starters, then make sure the water in your skimmer is flowing smoothly with no vortex or burping.

    The key to defeating algae is persistence and consistency. It shouldn't take more than a couple of days to get rid of the green. Follow the instructions in Defeating Algae and you should be well on your way to a clear pool by the weekend.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    TFP Guide

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    Re: blowing off skimmer lid

    When the pump is on is there water coming out of the return jets to the pool? Sounds like there is a lot of pressure getting built up inside the filter and with nowhere to go comes back up the suction line when the pump is off. Check to make sure there are no closed valves that should be open and that the selector for the filter is in the proper position to allow water to return to the pool. I suspect you will find something along those lines to be your problem. Also are the returns unplugged from the winterization? I will defer to one of the chemists on here to help you with the water clarity problems
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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    Re: blowing off skimmer lid

    It is not the skimmer basket on the pump. It is the one by the pool. Also, I have my multi-port valve set on filter. The return jets seem to be working fine and no closed valves.

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    Richard320's Avatar
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    Re: blowing off skimmer lid

    Quote Originally Posted by 60Tigers
    It is not the skimmer basket on the pump. It is the one by the pool. Also, I have my multi-port valve set on filter. The return jets seem to be working fine and no closed valves.
    Yes, that's what we assumed. Open the bleed valve on top of your filter when the pump is running and I bet you'll hear a lot of air hissing out before any water starts spraying.
    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: blowing off skimmer lid

    I do not have a bleed valve. Where is the o ring on the pump basket housing drain located.

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    Richard320's Avatar
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    Re: blowing off skimmer lid

    Quote Originally Posted by 60Tigers
    I do not have a bleed valve. Where is the o ring on the pump basket housing drain located.
    It would help us tremendously if we knew what type of filter and pool you have. If the pipes come out the top of your filter you won;t have an air bleed. Otherwise, you must. Mine is actually a collar that the pressure gauge is screwed into. Yours may be different. A picture would help..

    The pump basket aka strainer basket is the round clear plastic thing with the four ears in this picture:
    The drain, if it has one, will be somewhere on that down at the bottom.
    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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