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Thread: sense and dispense changing ORP & control of SWG

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    Join Date
    Feb 2018
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    Paia/HI
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    sense and dispense changing ORP & control of SWG

    Aloha,
    I am new to owning a pool and this forum. I'm learning how to be our pool girl. I have a background in Chemistry, but this is all new.

    I like automation, so I had the Hayward sense and dispense installed with omnilogic. We finally turned on our SWG T-15 and are having problems with a lot of ORP values changing. We have had no support from our pool builder (Pool Pro Maui) he just dumped in salt, and left and said to plug in the next day and call a pool maintenance company.

    I researched ORP and understand it needs to be 650mv, and the FC levels should be 1-3ppm. First try at SWG ORP of 650mv, my FC was >10ppm so called them back, and complained it isn't working and he came and dumped in CYA to 80ppm. raised salt to 3600ppm said to wait for the Chlorine to burn off. I had a biz trip and when I came back, I had green algae on my tile steps and no chlorine left. I shocked it, brushed off algae, and then have been following the chlorine and ORP values.

    My ORP has been around 600mv but last night, my ORP went to 290mv all of a sudden. I just turned it off and went to bed. Now it is back to 600mv, but that freaked me out.

    ORP is now 600mv with FC 3ppm. PH 7.5 CYA 80ppm

    I have set the ORP set point to 585mv. I am afraid to over chlorinate the pool again. Can someone give advice how to use ORP for the SWG? I think when the SWG gets turned on even at 585 it may over chlorinate.

    Mahalo
    Paia, Maui: 16x36 in ground gunite, hydrazzo pool & 9x9 tile spa
    Hayward: Omnilogic, sense and dispense PH and ORP controllers, tristar pumps, SWG T-15, 6 deck jets, 1 bubbler, colorlogic lights

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    Re: sense and dispense changing ORP & control of SWG

    ORP really doesn't work with cyanuric acid in the water.
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  3. Back To Top    #3

    Join Date
    Feb 2018
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    Paia/HI
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    Re: sense and dispense changing ORP & control of SWG

    Thank you for the reply. It was my pool builder who dumped it in telling me it won’t work without it

    what should I do now that I have cya 80ppm and a SWG cell and sense and dispense? Will Hayward help ?
    Paia, Maui: 16x36 in ground gunite, hydrazzo pool & 9x9 tile spa
    Hayward: Omnilogic, sense and dispense PH and ORP controllers, tristar pumps, SWG T-15, 6 deck jets, 1 bubbler, colorlogic lights

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    Mod Squad jblizzle's Avatar
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    May 2010
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    Re: sense and dispense changing ORP & control of SWG

    Welcome to TFP!!!

    You need the CYA to protect the FC from the sun. But, it also messes with the ORP (which is why we do not typically recommend them in outdoor pools, especially with SWG).
    Best bet is abandon the ORP sensor and just operate the SWG in normal timer, % output mode.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    TFP Guide
    cfherrman's Avatar
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    Re: sense and dispense changing ORP & control of SWG

    Pool without cya doesn't work

    Orp with cya doesn't work

    Tf100 with swg does work

    Forget the orp
    Casey
    Intex 24' x 52" Filled to 40-45", 2 Main Drains, 1 Skimmer, 1 Return, PVC
    1/2 HP Intex Pump 633T w/ Taeglus TA-40 175 lb 19.5" Sand Filter, Auqabot Extreme Robot
    TF-50 and Taylor 2006 Test Kits, Quality Well Water, Fleck 5800SXT Water Softener

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    Join Date
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    BOERNE, TX
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    Re: sense and dispense changing ORP & control of SWG

    With the caveat/adder of the word OUTDOOR, I agree with the last post.

    ORP and no CYA can work fine on indoor pools.
    14.5k gallon in-ground pebble sheen pool, attached spa, Pentair EasyTouch PS-8 control, Pentair 2HP Intelliflow VSP main pump, Pentair WhisperFlo 1.5HP accessory pump, Pentair Clean and Clear 520 Cartridge Filter, Pentair MasterTemp 400k heater, Polaris 3900 Sport cleaner, TF-100 test kit w/ SpeedStir

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