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Thread: Interpreting Results of Salt Test Strips

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    Interpreting Results of Salt Test Strips

    Hi all, I would like advice on how to read the results of the Aquachek Salt Test Strips that optionally come with the TF100 test kit.

    I have attached an image which shows how my test results look. As you can see, the white streak completely consumes the strip for a ways up, then only partially consumes the strip the rest of the way.

    My question is, do I read the result at A, B, or C?

    [attachment=0:2v84texn]salt_test.JPG[/attachment:2v84texn]

    Thanks!

    Kelly
    Attached Images Attached Images
    Rectangular Vinyl 20' x 40', 3.5' shallow end, 8' deep end, approx 33,000gal
    1.5 HP Pentair WhisperFlo / 60 gal DE Filter / 2 returns - 1 shallow end wall, 1 deep end floor
    SC-60 SWG / Autopilot Digital Pool Pilot v.4.2 / Polaris 280 w/ Booster Pump
    TF-100 Test Kit

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    Re: Interpreting Results of Salt Test Strips

    A. That's what the instructions say, and that's the reading that matches the output on my SWG.
    ____________
    34,000 gallon pool with charcoal Marquis aggregate finish
    Jandy stealth pump, cartridge filter and Aquapure SWG
    Solar heating with Goldline controller
    Polaris 380 Blackmax

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    Re: Interpreting Results of Salt Test Strips

    Ok, thanks. I was confused because the picture provided by the instructions do not show an upside-down U shape towards the end of the ****e streak. It simply shows the white part consuming the full width of the test strip.

    I had been using B as my measurement and recalibrated my SWG based on that. Based on this info, I will re-test and recalibrate.

    Thanks again,

    Kelly
    Rectangular Vinyl 20' x 40', 3.5' shallow end, 8' deep end, approx 33,000gal
    1.5 HP Pentair WhisperFlo / 60 gal DE Filter / 2 returns - 1 shallow end wall, 1 deep end floor
    SC-60 SWG / Autopilot Digital Pool Pilot v.4.2 / Polaris 280 w/ Booster Pump
    TF-100 Test Kit

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    no-mas's Avatar
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    Re: Interpreting Results of Salt Test Strips

    Quote Originally Posted by chazas
    A. That's what the instructions say, and that's the reading that matches the output on my SWG.
    Maybe I missed it - what are you supposed to read then - if not B, then A or C?
    18k gal inground, everbrite finish, 505 sq ft; 1.5 hp two speed whisperflow; rheem 5100ti 100k btu heat pump; 3 sheer descent falls; DE filter; swg (cell out and using trichlor for now)

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    JasonLion's Avatar
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    Re: Interpreting Results of Salt Test Strips

    Use A - the upper most tip of the white peak
    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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    Re: Interpreting Results of Salt Test Strips

    I've re-tested my salt level, and read the peak of the streak instead of the midpoint.

    I am measuring 5000ppm of salt. I think I may have overdid it at the beginning of the season.

    My autopilot claims to be able to support "special applications" which require high salt. So, I am assuming that this high level of 5000 will not damage my system in any way. I've seen info in the forums suggesting corrosion of pool equipment - do I need to be concerned about that at this level?
    Rectangular Vinyl 20' x 40', 3.5' shallow end, 8' deep end, approx 33,000gal
    1.5 HP Pentair WhisperFlo / 60 gal DE Filter / 2 returns - 1 shallow end wall, 1 deep end floor
    SC-60 SWG / Autopilot Digital Pool Pilot v.4.2 / Polaris 280 w/ Booster Pump
    TF-100 Test Kit

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    frustratedpoolmom's Avatar
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    Re: Interpreting Results of Salt Test Strips

    There was this recent post by Jason on the "Water Balance for SWG" thread....

    Quote Originally Posted by JasonLion
    I don't reccommend salt me eps over 5000, but that isn't why some SWGs shut down at 4000, or whatever level. Higher salt levels make the water more conductive and the SWG needs to turn down the voltage to compensate. Many SWGs have a voltage they can't adjust below so they have to shutdown to avoid overheating at high salt levels.
    I don't know much about them, can't help you here. Sorry!
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Interpreting Results of Salt Test Strips

    Ooooo! Thanks, this could possibly explain why my SWG volts are running so low. Interesting.
    Rectangular Vinyl 20' x 40', 3.5' shallow end, 8' deep end, approx 33,000gal
    1.5 HP Pentair WhisperFlo / 60 gal DE Filter / 2 returns - 1 shallow end wall, 1 deep end floor
    SC-60 SWG / Autopilot Digital Pool Pilot v.4.2 / Polaris 280 w/ Booster Pump
    TF-100 Test Kit

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    JasonLion's Avatar
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    Re: Interpreting Results of Salt Test Strips

    Corrosion risk grow very slowly up to about 5500 or 6000 and then gets suddenly worse a little above 6000. AutoPilot units are fine at high salt levels, they just lower the voltage as needed.
    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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