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Thread: Chlorine consumption

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    Chlorine consumption

    Just got a new hottub . we have had one before using bromine this one uses chlorine. My tub keeps consuming chlorine within a day of adding I'm back to zero.. Any ideas? I am very familiar with the pool forum I love it..wondering if there is a slam process for tubs?
    23k gal IG Vinyl Liner
    Sand Filter Pentair Pump VS
    Electric Heat Ft Wayne Indiana
    Built 2012

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    JoyfulNoise's Avatar
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    Re: Chlorine consumption

    Can you post full test results? Is this a new hot tub? Was it ever cleaned with Ahh-some prior to startup? Does it have an ozonator or UV lamp in it?


    Matt
    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 Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: Chlorine consumption

    Well I have only tested with the strips so far..ph is high at 7.8 as is ta at stabilizer good at 50..yes it Doe have a ozinator. .what is the best method to use ad far as sanitation? I did not clean it with anything because we bought it new..also seems like the foaming is pretty bad when I turn on the jets..not that I even trust the advice I get at the store but according to them i just add chlorine once a week and shock after we use it..
    23k gal IG Vinyl Liner
    Sand Filter Pentair Pump VS
    Electric Heat Ft Wayne Indiana
    Built 2012

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    JoyfulNoise's Avatar
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    Chlorine consumption

    Quote Originally Posted by jodyliebing View Post
    Well I have only tested with the strips so far..ph is high at 7.8 as is ta at stabilizer good at 50..yes it Doe have a ozinator. .what is the best method to use ad far as sanitation? I did not clean it with anything because we bought it new..also seems like the foaming is pretty bad when I turn on the jets..not that I even trust the advice I get at the store but according to them i just add chlorine once a week and shock after we use it..
    Jody,

    Please read the following sticky - How do I use Chlorine in my Spa (or pool)?

    Even a brand new tub needs to be cleaned with a biofilm and degreasing agent like Ahh-some. The reason being is the fabrication process leaves lots oils and chemicals behind. Chlorine will not react with all of that and so it needs a full cleaner. The foaming you mention is a good indication that the tub has crud in it.

    You need a good, high quality test kit. Strips are not going to cut it. Can you get a Taylor K-2006 test kit? That would work very well.

    The ozonator is probably causing your excess chlorine demand as well as the junk in you tub water. Ozonators can increase chlorine consumption by as much as 50% when a tub is not being used. With daily usage, the ozonator can help increase the oxidation of bather waste but, if no waste is present, the ozone will react with and neutralize chlorine. Some hot tub owners disconnect their ozonators all together to avoid these issues or rig them to a timer so they can be turned off as-needed.

    At this point you probably need to dump the tub and clean it so you can establish what your baseline chlorine demand is. Typically people will soak in a low FC tub and then add back enough FC to oxidize the bather waste and establish a residual FC until the next soak (typically 24 hours later). One uses dichlor as a chlorine source until the CYA has been built up to 30ppm and then they switch to bleach exclusively. TA is adjusted with acid to a low level of 50ppm or so to avoid pH rise during jetted tub use.


    Matt
    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 Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: Chlorine consumption

    Yes I will def get the test kit..thank you for the info I think I'm going to drain and clean..
    23k gal IG Vinyl Liner
    Sand Filter Pentair Pump VS
    Electric Heat Ft Wayne Indiana
    Built 2012

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