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Thread: Varying salt PPM readings - Pentair IC-40

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    Join Date
    Nov 2009
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    Indialantic, FL
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    Varying salt PPM readings - Pentair IC-40

    Don't recall seeing this, and so I'm wondering if anyone has seen it.

    Background: (Note: haven't yet picked up the Taylor K-1766, don't know that I will unless someone thinks it essential)

    New Pentair IC-40 controlled by an Easytouch automation system (v 2.08.0), supported by the Pentair VS-3050 variable speed pump.

    PB put in eleven (11) bags of pool salt - which should produce 3300PPM given they correctly estimated the pool at 16K gallons (one would hope they could produce a good volume estimate since they built it). Since there was a month of tab feeding before the salt, there should have been some number of salt equivalent in the water, but I expect the number to be low (?? less than 100 PPM ??).

    Scenario:

    At relatively low pump flow rates (~30 GPM) the Easytouch diagnostics reports salt at 3100PPM, at a mid-level flow rate (~50 GPM) the salt is reported at 3200PPM, and finally at around 80 GPM it reports 3300 PPM. I tried the salt test strips (acquired through the TFTestkit site) and they are reporting salt around 4000PPM.

    Question(s): Anyone else seeing this? Normal?

    Concern: For others having a difficult time reporting numbers for salt at their SWG, were they able to test at different flow rates (2-speed or variable-speed pumps)? Note: for my pool the difference of 3100 to 3300 PPM is roughly one whole 40lb bag of salt.
    Geometric 16X36', 16K gal, shotcrete, exposed aggregate plaster, acrylic coated concrete deck/cantilever coping;
    Pentair equipment suite (EasyTouch w/wireless, 2 Intellibrites, Intelliflo VS-3050, C&C 200 Filter, IC-40 SWG);
    Heliocol solar panels, Rocky's Roller, Blue Diamond robot

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    JasonLion's Avatar
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    Re: Varying salt PPM readings - Pentair IC-40

    The salt meters in SWGs are +-400, so 3100 and 3300 are essentially the same reading. That kind of small variation really doesn't make any difference.

    Trust the SWG and ignore the salt test strips, unless you have a good reason to believe that the SWG might be broken.
    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: Varying salt PPM readings - Pentair IC-40

    The test strips always test high. Thats true in my hands as well as a number of others here. Like Jason said, trust the Easytouch readout. Only excepetion i would say is if you new the salt was in the 3000-3500 range and the easytouch reads really low or high (say <2200 or >4200). Thenthere may be a censor issue.
    14,000 gallon IG, Vinyl. Hayward 3/4 hp superpump, Penatair IC40 SWCG, Pentair automation, Hayward sand filter, Aqua Comfort heat pump, Hayward 400k Lo-Nox LP heater.

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    Join Date
    Nov 2009
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    Indialantic, FL
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    323

    Re: Varying salt PPM readings - Pentair IC-40

    Thank you both.
    Geometric 16X36', 16K gal, shotcrete, exposed aggregate plaster, acrylic coated concrete deck/cantilever coping;
    Pentair equipment suite (EasyTouch w/wireless, 2 Intellibrites, Intelliflo VS-3050, C&C 200 Filter, IC-40 SWG);
    Heliocol solar panels, Rocky's Roller, Blue Diamond robot

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