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Thread: Ideal numbers ?

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    saraiks's Avatar
    Join Date
    Jul 2007
    Fremont, CA

    Ideal numbers ?

    There seem to be a general consensus on what the ideal numbers should be for a given pool setup for some paramenters but a wide array of numbers is thrown out for some others.. here is what I could glean from the forum so far for gunnite/Plaster pools with no SWCG

    CYA : 50 +/- 10
    TA : 150 +/- 50
    pH : 7.5 +/- 0.2
    CH : 220 +/- 20
    FC : 4ppm +/- 1

    Comments/ suggestions are welcome
    16,000 G in ground Gunnite (plastered) with attached Spa, Gemini 3 NG Heater, Sta-rite cartridge filter, Aquabot Mark V, TF test kit

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD
    There are several different ranges for most of the numbers depending on several factors. My suggestions are:

    CYA - either 30-50 (normal & ORP) or 60-80 (SWG or lots of sun) or 70-90 (really really lots of sun)
    TA - either 70-90 (bleach or SWG or lots of aeration) or 100-120 (trichlor or dichlor) or as low as 50 with borates
    PH - either 7.4-7.6 (normal) or 7.6-7.8 (lot and lots of aeration)
    CH - either 0 (vinyl) or 100-150 (spa) or 200-400 (plaster, pebble, stone) (fiberglass is unclear, 100+ or 200+?)
    FC - depends on CYA, see my Pool Calculator for suggestions (link in my signature)

    For a plaster pool I would fine tune the CH level based on the saturation index.

    Many of these numbers can go outside those ranges and still be fine and there are a few special situations where other numbers might be required.
    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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