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Thread: Pump Pressure

  1. Back To Top    #1

    Join Date
    May 2015
    Dallas, TX

    Pump Pressure

    We have a 10K gallon, unground pool that was installed 5 years ago. The 1st year was great and then the next 3 we had pressure issues. We had a 1 cartridge pump and after cleaning a new filter the first time the pressure would jump to 15-20 in a few hours reducing and sometimes stopping the output of water back into the pool.

    We had a "pool guy" come out a few weeks ago and he said our pump was too small for our size pool. We bought a much larger pump (4 cartridges) and started running it. Our pool was very dirty and by the next day the pool was crystal clear and we had to clean the cartridges. We clean with a garden hose with some pressure but not enough to loosen the cartridge from the bands. We've cleaned these filters 3-4 times in a 3 week period and only used the pool once so we didn't track too much dirt/grass into the water. We also use an electric pool cleaner which cleans a lot of the dirt.

    So now with a bigger and new pump, clean cartridges and not a large use of the pool we cannot keep the pressure below 12-15. As soon as the pump is turned on the pressure goes to 5 right away and then creeps higher. The company who installed the new pump has already said he doesn't know why the pressure is not staying low after cleaning and is not returning our calls.

    I read a thread stating possibly someone's pool still had a lot of dead (particles/algae???) even though the water is clear. Does anyone have any suggestions on what could be going on. Should we keep cleaning the filters and this should clear itself up?

  2. Back To Top    #2
    Isaac-1's Avatar
    Join Date
    May 2010
    SW Louisiana

    Re: Pump Pressure

    I suspect your pool is trying to grow algae, it takse a good bit of algae in the water before it becomes visible, and your filter is likely doing enough of its job filtering out that invisible algae and therefore needing to be cleaned. If you can post a full set of test results we might be able to narrow this down for you.

    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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  3. Back To Top    #3
    Mod Squad
    Join Date
    Aug 2012
    DFW, TX

    Re: Pump Pressure

    Welcome to TFP!

    It is likely a lack of chlorine causing algae to grow. If chlorine is not kept above the minimum level for your CYA level algae will grow, Chlorine CYA Chart

    If algae is growing in your pool then you need to SLAM Your Pool.

    Get a test kit from Test Kit Comparison, I use the TF100 from

    Here are some intro Pool School articles to read while you wait for your test kit
    TFPC for Beginners
    ABC's of Pool Water Chemistry

    Here are the Recommended Levels for your pool.
    Here are the Recommended Pool Chemicals and how to add them.
    Use PoolMath to figure out how much to add.
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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

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

    Re: Pump Pressure


    Yep - what they say. ^^^ Clogging a filter that fast indicates something is in the water. If you could post some test results, that would help a great deal. I'll go out on a limb and predict the CYA level will be in triple digits. Or the pool store shorthand of "99".
    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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