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Thread: Estimating pool size

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    Luric's Avatar
    Join Date
    Aug 2015
    Central NJ

    Estimating pool size

    I've always used "30k gal" as our pool size, but I don't actually have any idea where I got that from. I can't find it in any legacy records (we have the original paperwork from when the pool was installed 20+ yrs ago) or our pool inspection when we moved in last year. I tried using the details I do have with PoolMath, but I'm not sure I'm doing it right. I'm getting 50k gal which is pretty different! It's a freeform pool which makes it a bit more confusing. These are the dimensions I have. Any help?
    Attachment 51393
    Inherited 30k gal IG gunite black bottom pebble w/ waterfall & attached spa, built 1993ish; Pump: Pentair Intiliflo VS pump; SWCG: Pentair IC60; Filter: Pentair FNS Plus 60 SQFT DE; Heater: Pentair Mastertemp 400,000btu; Robot: Dolphin Nautilus Plus; Waterfall Pump: Hayward Super Pump 1.5 HP; Testing: TFTest Kit TF-100

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    Join Date
    Mar 2015
    Cantonment, FL (Pensacola Area)

    Re: Estimating pool size

    Some of the math wizards will be able to help get it close. For a ballpark range though I used FC and pool math. I tested FC with the 25ml sample. Added a known amount of bleach and tested again after it was mixed. I put those in as current and target, then changed the pool volume up above until the recommended amount matched what I actually put in.
    15,000 Gallons vinyl in-ground screen enclosed, Hayward Eco-star SP3400VSP, Hayward Aqua Logic PL-Plus, Hayward T-15 Salt Cell, Hayward S244T Sand Filter, Polaris 380 with booster pump, Hayward heat pump HP50HA. K-2006 kit.

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    txnole's Avatar
    Join Date
    Aug 2014
    Amelia Island, FL

    Re: Estimating pool size

    50,000 might not be far off, but it's very difficult for any of us to know on a free form pool without more information. For example, how is the pool shaped? Is there more area in the deep end or shallow end? What is the approximate slope?

    Do you have plans that show the size/depths of different areas? When you built the pool, did you happen to have a metered fill on your water bill?
    COMPLETED BUILD THREAD - 15'x29' rectangular offset shotcrete pool; 14,100 gal; 5'x7' raised spa with 400k btu fire feature; 7' spillover; 25' leuder stone raised bond wall w/waterfall; Pentair SWG; Pentair VS (pool); Pentair 3/4hp feature pump; 1hp spa blower; Pentair Cartridge filter; Pentair “Easy Touch 8” wireless; Dolphin Oasis Z5 robot; Solar Hydronics iSwim solar panels; Mansard Screen Enclosure; walnut travertine deck; 1 very happy kiddo.

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    needsajet's Avatar
    Join Date
    Jan 2016
    Sydney, NSW, Australia

    Re: Estimating pool size

    Try 35,000 gallons in PoolMath and the method Scott explained above. If you do it when the pool is sparkly clean and the sun is off the pool, it works.

    Also, regular use of PoolMath and recording predicted change vs. actual change, you should be over-shooting and under-shooting about the same amount. If constantly under-shooting the predicted change, lower your pool volume a bit in PoolMath until results get close most of the time.
    12k IG salt; glass beads in plaster; K-2006C, K-1766, CCL, and Aussie 4in1 (HTH); Pentair Eco800 1.2HP VS; Zodiac SWC 1.3 lb/day (25 g/hr); 25" filter recycled glass; OKU solar panels; 1/2 HP solar pump; Rebel (Warrior) pool cleaner; FlowViz; prior pool AG 10k | Read Before Posting to get the best possible advice | ... and this helped me a lot!: TFPC for Beginners

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