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Thread: Tricks for adding chlorine?

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    Join Date
    Feb 2012
    Location
    San Jose, CA
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    76

    Tricks for adding chlorine?

    I was surprised to read (and experience!) how much chlorine our 7x7 spa (attached to the pool) can consume, especially with lots of toddlers in it! So, I'm going to try to keep the chlorine level a fair bit higher than the rest of the pool when we're going to be using it a lot.

    How do you guys add chlorine every hour, especially when people are using it all day? Scenarios:

    1) People are around it, and freak out when they see you do anything with the pool
    - I don't really care too much about this, but I've tried to be sneakier about testing and especially adjusting levels.

    2) Adding chlorine while using the hot tub
    - Right now, I just say "everyone out for 30 seconds", turn the jets on, and pour in a good dash of 10% chlorine. I wish I could just throw a floating tab dispenser in there, but I really like my pool CYA low (it's around 15 now) since I have a pool cover, and the kids would bat it around a bunch.

    Spilling Over (pumping cold but chlorinated pool water into the hot tub) would maybe work too, but the spa temperature would drop.

    What do you guys do?

    cf. http://www.troublefreepool.com/threa...-Spa-(or-pool)
    Filled 5/1/2013! 36k gallon 20x40 IG with 7x7 spa, FinestFinish, AquaMatic cover, All Pentair: Clean&Clear 520 sqft cartridge filter, Intelliflow 4x160 variable speed pump, 2 HP whisper flow spa jet pump, 400k BTU MasterTemp heater, Letro Platinum pool cleaner, Rainbow 320 chlorine feeder, Pac Fab Bermuda skimmer
    More details: pics-new-pb-20x40-ig-gunite-7x7-spa-7x7-shamu-shelf-t54952.html

  2. Back To Top    #2
    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: Tricks for adding chlorine?

    Either a SWG or a bleach pump would take care of that situation.
    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

  3. Back To Top    #3

    Join Date
    May 2013
    Location
    Bay City, Michigan
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    283

    Re: Tricks for adding chlorine?

    Is your spa CYA at 15 also? IF so that is a big part of it. With the low CYA, high temps, uncovered, lots of sun, smaller amount of water, and frequent use, that is probably just how it will be.

    Living in CA, I'm surprised you don't have the same problem with chlorine not lasting in your pool given your CYA reading, unless it's covered a lot of the time.
    12500 gallons, 24 foot round above ground
    Hayward Sand filter, Pentair OptiFlo 1HP 2-Speed pump

  4. Back To Top    #4

    Join Date
    Feb 2012
    Location
    San Jose, CA
    Posts
    76

    Re: Tricks for adding chlorine?

    Can't do SWG, because the cover has metal railings

    Yep, the pool is covered a lot - we really like the cover with the kids around!
    Filled 5/1/2013! 36k gallon 20x40 IG with 7x7 spa, FinestFinish, AquaMatic cover, All Pentair: Clean&Clear 520 sqft cartridge filter, Intelliflow 4x160 variable speed pump, 2 HP whisper flow spa jet pump, 400k BTU MasterTemp heater, Letro Platinum pool cleaner, Rainbow 320 chlorine feeder, Pac Fab Bermuda skimmer
    More details: pics-new-pb-20x40-ig-gunite-7x7-spa-7x7-shamu-shelf-t54952.html

  5. Back To Top    #5

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
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    Re: Tricks for adding chlorine?

    The the bleach pump sounds like your best bet for automation. As for an SWG, you could get one just for the spa, but that precludes a lot of water mixing. The ControlOMatic Technichlor needs around 2000 ppm salt but that would just be for the small spa volume.
    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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    mitch08's Avatar
    Join Date
    Jun 2008
    Location
    Suffolk County, NY
    Posts
    370

    Re: Tricks for adding chlorine?

    I solve this by slightly 'cracking' the suction side... In other words, let's say you have it in full spa mode. So all water is being pulled from the spa and returned to the spa.

    I can adjust my valve to allow a very tiny amount of suction to come from the pool. Obviously all returning to the spa.
    This will create the slightest of waterfalls... This allows you to constantly (and very slowly) get 'fresh' pool water into the spa. It should be slow enough where you don't really notice a difference in temperature. It also obviously helps with refilling the tub from water displacement.

    I dont usually do this unless the spa is getting extremely high use. If its just moderate use, I leave it on spa mode and when people get out for a bit, I run it in spillover mode for a few minutes to get fresher water into it...

    Also, at times I still use a puck chlorinator. But when I have it in spa mode, I turn it off or set it extremely low because the FC levels can get extremely high very quickly. Im not sure how a SWG would handle that aspect. You are no longer trying to chlorinate 20,000 gallons of water, but a few hundred

    Good luck!
    18x38 Inground Liner (25k gal) Paver surround, multi-speed pump, DE Filter, Raised spill over spa, TF-100

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