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Thread: Sodium Dichloro-S-Triazinetrione Dihydrate - on stand alone Spa

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    Sodium Dichloro-S-Triazinetrione Dihydrate - on stand alone Spa

    I have a 500 gal stand alone spa and been using Leisure Time Spa-56 (Sodium Dichloro-S-Triazinetrione Dihydrate -99%). Does this chlorine type add CYA? It seems over time, after replacing the water, I need to add more and more chlorine to the water leaving me to suspect the water is accumulating too much CYA. And by the way, the spa dealer tells me not to worry about water hardness for Spa's especially if I get water from the city. Thanks.
    14,000 gals; IG gunite - Wet Edge Primera Stone finish; Sta-Rite/Pentair Intelliflo variable speed; Sta-Rite/Pentair system3 S7M400 cartrige; Sta-Rite Max-E-Therm 400 heater; (Pentair Rainbow 320 Chlorinator- for vacation use only); built-in automatic pool cover; Trident II UV system (on recall not currently used); built 10/31/2012; TFT-100; MX8 cleaner

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    Mod Squad JVTrain's Avatar
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    Re: Sodium Dichloro-S-Triazinetrione Dihydrate - on stand alone Spa

    I would strongly suggest reviewing these two items: Pool School - How to Chlorinate Your Pool and How do I use Chlorine in my Spa (or pool)?)

    The chemical you're using is commonly known as dichlor. It certainly will add CYA to your spa. Roughly 9 ppm of CYA per 10 ppm FC added, if I am recalling correctly, so it will very quickly elevate your CYA. Once your CYA is too high, you need unpractical levels of FC to maintain proper sanitation. See Pool School - Chlorine / CYA Chart

    Hardness is typically not a concern for spas especially with city water that tends to have moderate levels of hardness. ~100-300 ppm. Fiberglass spas are not sensitive to low CH like plaster pools although very low CH may cause excessive bubbles or foaming. If you're not seeing foaming (in a properly sanitized spa) your CH is fine. Very high CH could cause scaling at the water line.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Re: Sodium Dichloro-S-Triazinetrione Dihydrate - on stand alone Spa

    Quote Originally Posted by JVTrain View Post
    I would strongly suggest reviewing these two items: Pool School - How to Chlorinate Your Pool and How do I use Chlorine in my Spa (or pool)?)

    The chemical you're using is commonly known as dichlor. It certainly will add CYA to your spa. Roughly 9 ppm of CYA per 10 ppm FC added, if I am recalling correctly, so it will very quickly elevate your CYA. Once your CYA is too high, you need unpractical levels of FC to maintain proper sanitation. See Pool School - Chlorine / CYA Chart

    Hardness is typically not a concern for spas especially with city water that tends to have moderate levels of hardness. ~100-300 ppm. Fiberglass spas are not sensitive to low CH like plaster pools although very low CH may cause excessive bubbles or foaming. If you're not seeing foaming (in a properly sanitized spa) your CH is fine. Very high CH could cause scaling at the water line.
    Thanks JVTrain - I started using BBB on my swimming pool for about 1-1/2 years now (pool is about 3 years old) and so far the pool is looking good (thanks mostly to chem geek). I've always taken care of our Spa using Leisure Time chemicals and method, but the drought in California and the changes in water sources for our City had caused some weird effects on the spa (pool too, but I am able to keep that under control). I'll read up on the link for the spa you mentioned above.
    14,000 gals; IG gunite - Wet Edge Primera Stone finish; Sta-Rite/Pentair Intelliflo variable speed; Sta-Rite/Pentair system3 S7M400 cartrige; Sta-Rite Max-E-Therm 400 heater; (Pentair Rainbow 320 Chlorinator- for vacation use only); built-in automatic pool cover; Trident II UV system (on recall not currently used); built 10/31/2012; TFT-100; MX8 cleaner

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