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Thread: Need help on spa volume

  1. Back To Top    #1

    Join Date
    Sep 2015
    Los Angeles

    Need help on spa volume

    I'm terrible at math so I hope someone can help me. I know my estimate must be off because my pool math never works.

    I have a spa with spillover basin.

    Basin is 41x33x18

    Spa is 78x96

    stairs are 18 width
    19 depth

    At the deepest point the spa is 44 inches

    I had estimated 1200 gallons


  2. Back To Top    #2
    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Central Minnesota

    Re: Need help on spa volume

    Just using the formula for an ellipse in two sections:
    78x96x26" (the 26 is 44 depth minus basin depth of 18)

    Gives about 665 gallons.

    If it is rectangular, it's closer to 950 gallons.

    Do the stairs protrude from the side? What is the distance from the back of the top step to the front of the bottom step? If they protrude outside the other dimensions, you're likely not adding much more than 20-40 gallons there, depending on length of steps run.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

  3. Back To Top    #3
    philboyj's Avatar
    Join Date
    Jul 2015
    Houston TX

    Re: Need help on spa volume

    My calculation was close to 1100 gallons using 7.5 as multiplication factor
    Geometric pool with all Pentair equipment. Raised spa - 18" with Artic Lagoon 1" glass tiles. 3HP VS Pump, 2 skimmers, 6 returns, IC40 Salt system, Easy Touch 8 with LED color light in pool and spa. 1200 sqft of Marble White Pavers decking in Versailles pattern. Tiling and coping almost completed, Indigo Blue Prism Matrix plaster. Pool Build Thread: Houston (Katy) Pool Build - Started April 2016

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