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Thread: Hayward Sense and Dispense in Spa vs Pool Mode

  1. Back To Top    #1

    Join Date
    Jun 2014
    Austin, TX

    Hayward Sense and Dispense in Spa vs Pool Mode

    Should a Hayward Sense and Dispense system (AQL-CHEM) turn off the dispensing of acid automatically when the ProLogic goes into "spa mode"?

    My S&D reads pH too high (vs a manual test) when in system is in spa mode (e.g., 8.5 instead of 7.5), but is accurate when in pool mode. This causes the S&D to inject acid into the spa when not necessary, and it will continue for a time when the system switches back to pool mode, and this causes an actual reduction in pH that is too much, and the water in both the spa and the pool ends up being too acidic. I am showing signs of my plaster getting eaten away and have even had a couple of leaks around nozzles in the pool where too much acid has eaten away around the edges.
    IG Pool Size: 24,000 gallons
    Flagstone Decking, Pebble Plaster
    Cartridge Filter
    Date of pool build October 2014
    Spa , SWG

  2. Back To Top    #2
    JoyfulNoise's Avatar
    Join Date
    May 2015
    Tucson, AZ

    Re: Hayward Sense and Dispense in Spa vs Pool Mode

    This same issue was reported in another post a few weeks ago by a different user. Same exact problem with the same exact system. I'm not sure what the resolution was but I know they were working with their PB and Hayward on a possible resolution through warranty.

    In general, these automated dosing systems should be shut off during SPA mode. Spa's are significantly smaller volumes of water that can and should be treated after use not while people are in it. There's really no major downside to waiting until after exiting the spa but there is a lot of downside if people are in the spa and the acid dosing system goes crazy.
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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