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Thread: Spa aeration: pH rise... Natural equalisation?

  1. Back To Top    #1
    Daf-Tekno's Avatar
    Join Date
    Sep 2014
    Calgary / AB

    Spa aeration: pH rise... Natural equalisation?

    Hi TFPers,

    I was thinking today:

    1. If, in a Spa, aeration is commonplace
    2. and such raises pH

    would a happily-balanced Spa's pH naturally settled back down to its original lower pH if left alone for a set length of time,
    or are we Spa owners always required to add Muriatic Acid / powdered equivalent on a regular basis to keep pH in check?

    It just feels like I'm constantly fighting something as I keep having to add acid to the water.
    Maybe it's just part of the job...

    Thanks - D
    Jacuzzi J480 (2008) 1700 litres, Balboa ozonator, Delta EZ-18-120 UV lamp via custom 6-way 2-tier timer solenoid array, 2 x Waterway 4HP main pumps,
    1 x Aqua-Flow 1/15 HP circ pump, ChlorMaker IL SWG, SmartSeal + Roxul skirting insulation, 8' x 8' ThermoFloat Spa blanket, 100" x 100" Gator coverall

  2. Back To Top    #2
    jojoman's Avatar
    Join Date
    Jun 2014

    Re: Spa aeration: pH rise... Natural equalisation?

    I don't think it will go down by it's self if that's what your asking.
    12K gal, custom flipped kidney bean with spillover spa. All Pentair equipment, Whisperflo 1 1/2 HP, 400K BTU heater, Intellichlor IC 40 SWG, CCP-320 Cartridge filters, Kreepy Krauly pool cleaner with bootster pump, QuartzScapes in Aruba Sky blue, LED lights and travertine tiles for decking and stones on rear edge for landscaping. TF-100 test kit w/ SpeedStir

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Spa aeration: pH rise... Natural equalisation?

    For a standalone spa, you lower the TA until the PH is stable.

    Once the PH has gone up, it will not go down again without adding chemicals.
    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

  4. Back To Top    #4
    Mod Squad
    Join Date
    Aug 2012
    DFW, TX

    Re: Spa aeration: pH rise... Natural equalisation?

    Here is a hot tub care article with a fairly in depth discussion of PH.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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