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Thread: Bigger pump on Intex sand filter

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    Bigger pump on Intex sand filter

    I found a good deal on a 1.5 hp pool pump. Since my Intex pump was getting noisier,I bought it and installed today. Wow! does it ever push water! I hooked up my vacuum hose and turned the pump on. The pump started surging right away. What would cause this? I backwashed and retried with the same results. Any Thoughts?? I have an Intex 16X48", new 1.5 hp pump, Intex sand filter, Intex SWCG.
    Last edited by dozerdude; 07-21-2014 at 07:53 PM. Reason: sig

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Bigger pump on Intex sand filter

    Surging means air is getting into the suction side plumbing. That could be something simple like the water level too low allowing air to be drawn into the skimmer or a bad seal on the pump strainer basket lid, or it could be something more complex, like an air leak in the plumbing.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    y_not's Avatar
    Join Date
    Jul 2012
    Redmond, OR

    Re: Bigger pump on Intex sand filter

    I would check those silly plastic grates they molded into the inlet and return fittings on the pool wall. They restrict flow, and when they get clogged, they cause air leaks to occur at the hose couplings due to the increased suction pressure of the restriction.

    Honestly, I Dremel'd mine out.... much higher flow now too.

    Sent from my PC36100 using Tapatalk 2
    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
    Pump & Cart Mod: 1000gph Cart. 5ft² - 2 nylons, 24/7 OP. Traps bugs/bits, lasts longer/cleans easier = Happier Pool Owner!!
    The Bible for a "Trouble Free Pool" life = PoolSchool, the BBB method a TF100 test kit(Recommend Kits Compared). - Cleaning a Sand Filter
    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

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    Join Date
    Jul 2014
    Bastrop, Louisiana

    Re: Bigger pump on Intex sand filter

    Reciently I upgraded from the OEM cartridge pump to a larger sand filter also.
    Also, I have modded my strainer (output from pool to input of pump) connection to accept various other "fittings". One "fitting" is a vacuum hose connection that fits over the strainer.. I have noticed that while using my vac hose that my pump will surge and that i will hear a vacuum leak (it sounds like someone sucking the last bit of soda through a straw).
    Upon doing some research a couple of days ago, I believe that I have found the problem, which is that on the Intex pools that there is a vacuum relief valve. It is supposedly located right next to the flow valve at the strainer connection.
    When i bought this pool in July of 2013, there were two clear rubber caps included in the box. i suspect these are to be used to disable the vacuum relief when upgrading to a larger filter. I have not had the time to confirm this at this time.
    Randy H.

    Intex 18' X 48"
    G.A.M.E. Sandpro 75 Sand Filter (Single Speed 3/4 HP, 75 lbs sand, 2650 GPH, 7-way valve)

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