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Thread: CYA change after adding salt?

  1. Back To Top    #1

    Join Date
    Apr 2008
    Location
    Burlington, WI
    Posts
    67

    CYA change after adding salt?

    I ran a complete set of numbers last weekend. On Tuesday, I added 300# salt to my pool. I had my wife run a set of numbers this morning. The CYA was half. Is that possible? Temp 88-91. Indoor. Salinity 1510 by Aqua check strip.

    4/27 or 4/28 5/4

    FC 5 FC 5
    TC 5 TC 5
    pH 7.2 pH 7.2
    Alk 210 Alk 180-190
    CH 430 CH 370
    CYA 60 CYA 30
    58,800 gal gunite INDOOR pool w/ spa
    automatic cover
    Jandy "stuff" - pumps, cartridge filter, aqua link
    CAT Controller 4000
    Stenner 30 gal (bleach) and 15 gal (acid)
    Puck chlorinator and Nature 2- gone
    Hi-Z Heater - natural gas

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887
    The CYA level didn't change. The test is kind of subjective. You want to keep adding solution till the black dot completely disappears. There are pictures of how it should look here.

    On TA & CH, once the color starts to change you want to keep adding drops as long as the color continues changing. If you add a drop and the color doesn't change any further then don't count that drop. The CH test also requires through swirling to mix after each drop.
    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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