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Thread: Intex Pool Question - Parallel Pumping?

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    Intex Pool Question - Parallel Pumping?

    Ive got a 15x36 ft Intex inflatable ring circle pool. 2 years ago, last time i had it up i suffered from a nearly useless vaccuum with my 1000GPH cartidge filter. So this year i thought id use my 2nd NIB 1000GPH filter in parallel to get vacuuming done better as well as cut my run time in half. I want to have 1 outlet from pool going to a PVC "T" connector, one filter will be connected to SWC then back into at "T" connector after SWC for return to Single inlet back to pool. And the other side of the "T" will simply have my other 1000 GPH Filter on it going to the "T" again and back to pool.

    Am I accomplishing 2000 GPH by this design? Or at least more than 1000? Will this ruin pumps? Is the "T" connector after the filters going to be disrupted by water flowing into itself or continue out unimpeded?

    Any help would be great, i have all the materials to make it work, just wanted to run it by you fine folks to see if I'm wasting time and money bf I can return the materials and save up for a larger sand filter down the road.

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

    Re: Intex Pool Question - Parallel Pumping?

    It would be simpler and better to get a larger pump!

    Still what you are suggesting can be done. The key is that the two pumps must be identical and have identical hose lengths between them and the T joints. If you put the SWG on one side, and not on the other you will unbalance the paths and the two pumps will fight each other and efficiency will go way down. It won't move anything close to twice as much water, but it will do significantly better than a single pump.
    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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    Join Date
    Aug 2011
    Virginia Beach

    Re: Intex Pool Question - Parallel Pumping?

    We had several inflatable ring pools and all of them suffered the same trouble as yours. I upgraded to a sand filter and it's been SO much better. Last year when we got the 18x48 Ultra Frame I didn't even bother with the pump that came with it- it's never been plugged in. The pump/filter combo we got was around $200 @ the pool store, but it's well worth it. It is capable of doing the job, it's strong enough to vacuum effectively, and I think it filters better. Ours is a Columbia horsepower 50lb sand filter. It does well for our 7600 gallons, it did just as well but even faster in the smaller pool we had prior to this one.
    Intex Ultra Frame 18' X 48" 7600 +/- gallons
    Columbia 50 LB sand filter/ HP pump, $$ WELL spent(2nd best thing bought for the pool)
    Virginia Beach, VA
    TF100 test kit- Money WELL spent (best thing I've ever bought for the pool)
    Leisure bay hot tub

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    Re: Intex Pool Question - Parallel Pumping?

    I hear you both on the bigger filter suggestion, just had the same filter NIB sitting around and was hoping that I could swing something this way for a few bucks in hoses and PVC. As long as you think i'm not going to ruin anything, I think im going to give it a shot. A little less efficient 2000 is better than 1000 in my book. I have exactly the same lengths of hose so my setup will be an exact match other than the SWC. I'll report back when it gets up and running.

    Do you think that if I were to run one filter without shutting off the other "T" to the other filter ever if im going to suffer serious performance issues. I suspect I would.

    Thanks again for any advice!

  5. Back To Top    #5

    Join Date
    Jul 2012
    SE Minnesota

    Re: Intex Pool Question - Parallel Pumping?

    How about cutting a new return hole in the pool for one of the pumps. I did a quick search and it's been covered in these forums. Looks pretty easy.
    Intex Easy Set 18'x48" 7 years old (retired)
    Intex Ultra Frame 26'x52"
    Intex 2,500 gal/hr pump with Unicel cartridge filter.

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    linen's Avatar
    Join Date
    Jul 2010
    Twin Cities, MN

    Re: Intex Pool Question - Parallel Pumping?

    Can you t the pumps back together before the swg?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    mas985's Avatar
    Join Date
    May 2007
    Pleasanton, CA

    Re: Intex Pool Question - Parallel Pumping?

    Parallel pumps will only produce twice the flow rate if the composite head loss remains the same as the single pump which can only happen with completely separate (and identical) plumbing systems. Sharing any of the plumbing between pumps will increase head loss and reduce the flow rate of both pumps and the more plumbing that is shared, the less the composite flow rate. If all the plumbing is shared, the composite flow rate is usually less than 10% above the single pump flow rate. However, sharing just the tees at the pool shouldn't reduce the composite flow rate by much. Maybe 10% for a flow rate gain of 90%.

    Because of this effect, I would avoid sharing plumbing as much as possible even if it means that one pump has a little less head loss than another.
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater, ThePoolCleaner

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