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Thread: SPA/Hot tub chemistry question....

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    soupy8728's Avatar
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    SPA/Hot tub chemistry question....

    My spa/hot tub is connected to my pool so this question is for the folks who have a stand alone system:

    Is the chemistry the same? What I mean is, do you still add the same types of stuff as you would your pool? Bleach, muriatic acid, borax....and the such? Just curious. I was in Leslies the other day buying a new o-ring and there was a couple in there asking questions and naturally they were sold about $75 worth of product so I gave them this website info and told them to read and ask questions before dumping that stuff in there. I'm just looking to be informed for the next time I run into someone in this situation. Thank you all!

    ~Carl
    IG Plaster with raised spill-over Spa, ~26,000 gallons, Built 2001
    Cartridge filter
    Solar heated

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    Mod Squad JVTrain's Avatar
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    Re: SPA/Hot tub chemistry question....

    I chlorinate my pool and spa with the exact same chemicals. Test with the same kit. Etc, etc, etc. I do tend to push my FC higher in the hot tub because I don't lose it to sunlight (mostly covered) so I can wait longer between testing/adding bleach.

    Wait! There is one difference! I use 8.25% bleach in the hot tub, 12.5% in the pool. Lower hypochlorite concentration is more stable and easier to bump up FC with larger volumes in a small tub.
    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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    soupy8728's Avatar
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    Re: SPA/Hot tub chemistry question....

    Thanks Joel...so on the Pool Math calculator, you just substitute your numbers in? Number of gallons of water....blah blah blah....and are the targets still the same based on the FC/CYA charts? Sorry for the dumb question but I just don't want people to be discouraged from the enjoyment that we all partake in! LOL!
    IG Plaster with raised spill-over Spa, ~26,000 gallons, Built 2001
    Cartridge filter
    Solar heated

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    JasonLion's Avatar
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    Re: SPA/Hot tub chemistry question....

    For a stand alone spa you use different TA levels, and you add chlorine after each time you use the spa as well as on a regular schedule. But by and large things are very similar. See the sticky at the top of the Spa/Hot Tub section of the forum.
    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

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    Mod Squad JVTrain's Avatar
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    Re: SPA/Hot tub chemistry question....

    Yep. All the same. For full details on maybe some slight variations on start up and maintenance this thread is AWESOME. How do I use Chlorine in my Spa
    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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    soupy8728's Avatar
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    Re: SPA/Hot tub chemistry question....

    Thanks Jason.
    IG Plaster with raised spill-over Spa, ~26,000 gallons, Built 2001
    Cartridge filter
    Solar heated

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    Isaac-1's Avatar
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    Re: SPA/Hot tub chemistry question....

    Also non-chlorine sanitation options are a lot more popular in Hot Tubs than pools, I am including use of Bromine in this as well as mineral / MPS etc.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Re: SPA/Hot tub chemistry question....

    What about SWG for spas - is that an option?
    Vinyl 18'x36' in-ground 100,000 L, Jandy Aquapure 1400 SWCG, Jandy Lite2 heater, StaRite System3 filter, Evac tube solar heating panels

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    Isaac-1's Avatar
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    Re: SPA/Hot tub chemistry question....

    It is, in fact I have one
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

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    Re: SPA/Hot tub chemistry question....

    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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