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Thread: Pressure problems after sand change and opening

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    Join Date
    May 2016
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    Arlington Hts, IL
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    Pressure problems after sand change and opening

    We had our pool company change out the sand in our filter, 2 days later we opened our pool ourselves for the first time. It went well everything seemed to be working. When starting to vacuum winter debris from bottom it just wasn't vacuuming well. It was a little dirtier than usual but my vacuum usually is pretty efficient. I usually don't have to backwash but maybe twice on the opening vacuuming. This time I did it 5 times. Did notice that my psi is running at 20 -25 while in the filter position yet in backwash or rinse it runs 12-15 psi. I'm thinking something is wrong with the sand filter. The service guy says he expected to use 3 - 50 lb bags of sand but put in 4 he also said he only took. He only took out what was dirty as he thought he may not enough sand. Any thoughts?
    40 year old inground pool
    30,000 gallons
    2013 complete renovation
    New piping,one piece fiber glass liner
    New equipment /sandfilter, pump, gas heater

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    Mod Squad jblizzle's Avatar
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    Re: Pressure problems after sand change and opening

    Welcome to TFP!

    I am not sure what your question is. Everything you wrote sounds pretty normal to me, although there is rarely ever a need to replace sand.
    Jason, TFP Moderator
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  3. Back To Top    #3

    Join Date
    May 2016
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    Arlington Hts, IL
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    Re: Pressure problems after sand change and opening

    Hello, the problem is my vacuuming is not working well. My returns are strong. Why is my vacuum not as poweerful? Usually the suction is great, but now this year I had to close 1 of the skimmers and drain to bring the suction strong enough to clean dirt and mostly worms. I was told in the beginning that the psi should be around 12 mine is running 20 - 25. Is that ok?
    40 year old inground pool
    30,000 gallons
    2013 complete renovation
    New piping,one piece fiber glass liner
    New equipment /sandfilter, pump, gas heater

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    Mod Squad pooldv's Avatar
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    Aug 2012
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    DFW, TX
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    Re: Pressure problems after sand change and opening

    Maybe its time to deep clean the sand filter to see what went wrong, here is how, Deep Cleaning a Sand Filter. Or have them redo it.

    Please add your state or country to your location in your profile so it shows up over there <----, climate is often an important factor when we help you with your pool.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Casey's Avatar
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    Apr 2007
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    Re: Pressure problems after sand change and opening

    Welcome to TFP. As previously stated, you very rarely ever have to change sand from a sand filter unless performing a Baquacil conversion. Deep cleaning is all one should be doing to clean the filter. Sand does not go bad.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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