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Thread: Weight or volume

  1. Back To Top    #1

    Join Date
    Aug 2010
    Columbia, SC

    Weight or volume

    I am working with balancing a spa and a pool. I am using the Pool Calculator for the pool and another calculator for the spa. I am wondering how most people use the recommendations. It seems most of the information is usually based on weight. I learned on the spa (I had it before the pool) and learned using volume measurements. I have tried a scale to weigh the chemicals but the measurements don't seem to correlate.
    20K Gal Blue Plaster IG with rock waterfall, Beach Entry, Hayward Goldline Pro Logic controller and SWG,
    Sta-Rite System 3 S7M400 cartridge filter, 1-1/2 HP pump, Energy Therm Heat Pump, Nexxus Savi LED lighting

    500 Gal Dynasty Miramax Fiberglass Cinema Spa

  2. Back To Top    #2

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Weight or volume

    Weight measurements are the accurate ones assuming concentrations are known (at least for The Pool Calculator; I can't comment on the other calculator you are using since I don't know what it is). Volume measurements are always approximate and based on a density estimate. You can always measure the weight of a known volume of settled product (tap the cup to settle the contents) and can do your own conversions, but usually The Pool Calculator is pretty good.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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