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Thread: First chemical test of Spa

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    Chatabox's Avatar
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    First chemical test of Spa

    Hi,

    Thought I would post my results:

    PH - 7.6
    CYA - <30
    FC - 2ppm
    CC - 2.5 ppm
    Calcium - 75 (what's the short code for calcium?)
    TA - 150ppm



    Here's what I'm currently using, and hoping to switch to the bleach method when my current chemicals run out. I was expecting chlorine to be low due to what we're currently using.


    Ozonator
    Nature2 mineral sanitiser
    Non Chlorine Ultra Shock 2x weekly (Potassium Peroxymonosulphate)
    Lithium Hypochlorite dosed at each spa usage
    5900 litre or 1558 gal above ground swim spa. Approx 5 years old and heated to 37 degrees celsius year round. Cartridge filter, ozonator, Nature2 mineral sanitiser, Aqua Health non chlorine based shock, Lithium Hypochlorite dosed at each spa usage. Filled using mostly stored rainwater from tanks, and town water when the tanks are drained.

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    Chatabox's Avatar
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    Re: First chemical test of Spa



    I was a little unsure on the PH though. Opinions?
    5900 litre or 1558 gal above ground swim spa. Approx 5 years old and heated to 37 degrees celsius year round. Cartridge filter, ozonator, Nature2 mineral sanitiser, Aqua Health non chlorine based shock, Lithium Hypochlorite dosed at each spa usage. Filled using mostly stored rainwater from tanks, and town water when the tanks are drained.

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    Re: First chemical test of Spa

    Awesome, that looks like a very nice test kit...

    PH: looks like 7.5 to me right between 7.4 and 7.6
    CYA: is perfect, for your spa/small pool right around 20 to 30 is what you want
    TA: Use muriatic acid to drop down to 70, it will help very much with the foam and your PH rise, you can do it the fast way by dropping ph to 7 and running the spa to bring it back up to 7.4 and do it again.
    CH: (calcium) it is fine for your spa

    here is where it gets interesting. Most keep the FC level low (where you have it) and then raise it after use (like you do) What you are using should not be raising your combined chlorine CC like that. I will ask around and see and let you know.

    That Lithium Hypochlorite is very expensive here so I am sure you will love not spending on that any more.

    Quote Originally Posted by Chatabox View Post
    Hi,

    Thought I would post my results:

    PH - 7.6
    CYA - <30
    FC - 2ppm
    CC - 2.5 ppm
    Calcium - 75 (what's the short code for calcium?)
    TA - 150ppm



    Here's what I'm currently using, and hoping to switch to the bleach method when my current chemicals run out. I was expecting chlorine to be low due to what we're currently using.


    Ozonator
    Nature2 mineral sanitiser
    Non Chlorine Ultra Shock 2x weekly (Potassium Peroxymonosulphate)
    Lithium Hypochlorite dosed at each spa usage
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

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    Chatabox's Avatar
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    Re: First chemical test of Spa

    I'm not sure if there is any CYA in all honesty. That's why I just put less then 30, as 30 was the lowest marker the kit had. My water was completely clear and didn't cover the little picture at the bottom at all. The standard the kid came with was 50, and that turned the water very opaque. So I would be more inclined to think it's closer to 0.

    I was wondering why the CC was so close to the FC. I didn't think that was normal. But I tested with the standards that came with the kit and got them matching perfectly to their numbers. So it appears my testing methods are correct. I might try them again in the morning.

    I'm going to get a pool shop test done tomorrow as I'm interested to see how different they are. I'm also going to ask if they test for metals at all. I know they didn't last time.
    5900 litre or 1558 gal above ground swim spa. Approx 5 years old and heated to 37 degrees celsius year round. Cartridge filter, ozonator, Nature2 mineral sanitiser, Aqua Health non chlorine based shock, Lithium Hypochlorite dosed at each spa usage. Filled using mostly stored rainwater from tanks, and town water when the tanks are drained.

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    Re: First chemical test of Spa

    Quote Originally Posted by cowboycasey View Post

    That Lithium Hypochlorite is very expensive here so I am sure you will love not spending on that any more.
    Yes indeed it is! I brought a container of the shock and Lithium Hypochlorite which will last around 2 months... $130. This is why I can't bear to start straight away. I can't put that much $$$ in the trash. It was painful! That's why I started looking into other methods.
    5900 litre or 1558 gal above ground swim spa. Approx 5 years old and heated to 37 degrees celsius year round. Cartridge filter, ozonator, Nature2 mineral sanitiser, Aqua Health non chlorine based shock, Lithium Hypochlorite dosed at each spa usage. Filled using mostly stored rainwater from tanks, and town water when the tanks are drained.

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    Re: First chemical test of Spa

    Ok, 0 CYA is fine for now.. it will help to raise it once you convert over to about CYA of 20 to 30..

    Once you start to convert over read this and start using Dichlor to raise you CYA and FC

    How do I use Chlorine in my Spa (or pool)?)
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

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    Re: First chemical test of Spa

    Dump all of the fancy chemicals, get rid of the "mineral" system and ignore the ozonator (most breakdown after a year or so and owners rarely ever know they've stopped working).

    Follow this - How do I use Chlorine in my Spa (or pool)?)
    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: First chemical test of Spa

    Quote Originally Posted by JoyfulNoise View Post
    Dump all of the fancy chemicals, get rid of the "mineral" system and ignore the ozonator (most breakdown after a year or so and owners rarely ever know they've stopped working).

    Follow this - How do I use Chlorine in my Spa (or pool)?)
    Yes, that is the point of me being here, as previously mentioned. However I'm not willing to dump them right now, when I literally paid $130 less then 2 weeks ago. This is why I am still in the researching stage, as I want a good understanding of the new method prior to switching over. $130 is a lot of money for me.

    Thanks for the link though.
    5900 litre or 1558 gal above ground swim spa. Approx 5 years old and heated to 37 degrees celsius year round. Cartridge filter, ozonator, Nature2 mineral sanitiser, Aqua Health non chlorine based shock, Lithium Hypochlorite dosed at each spa usage. Filled using mostly stored rainwater from tanks, and town water when the tanks are drained.

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    Re: First chemical test of Spa

    The lithium hypochlorite and MPS can be kept. The lithium hypochlorite can be used in place of bleach in the chlorinating process but you will still need some dichlor to build up the stabilizer level. MPS is not really needed in a properly chlorinated spa and will interfere with the DPD-FAS chlorine testing. It can be saved and used in those situations where the spa had a high bather load to help oxidize bather waste faster. Chlorine is a better oxidizer than MPS but the MPS will not go bad so simply store it in a cool, dry place.
    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: First chemical test of Spa

    As cowboycasey pointed out, it's the CC that's the concern. MPS (Potassium PeroxyMonoPerSulfate) when used will show up as CC on the FAS-DPD test for up to about a day, perhaps slightly longer. How long had it been since your last MPS addition before you tested?

    Is the spa outdoors? Do you leave it uncovered at all other than when using it?
    Last edited by JVTrain; 04-15-2016 at 11:05 AM. Reason: MPS clarification
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    Isolated Spa - 345 Gallons

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    Re: First chemical test of Spa

    I added some on Wednesday morning, then a little more on Thurs morning as it wasn't enough. The test was done on Fri night. So I might test again this morning. Being new to this process, I want to make sure I'm doing it right.

    Yes the spa has covers. We actually only use it at night also. Just took this pic. The covers are insulated, so are quite thick.

    (Ignore the water on the covers. The rain hasn't been evaporated yet.)

    5900 litre or 1558 gal above ground swim spa. Approx 5 years old and heated to 37 degrees celsius year round. Cartridge filter, ozonator, Nature2 mineral sanitiser, Aqua Health non chlorine based shock, Lithium Hypochlorite dosed at each spa usage. Filled using mostly stored rainwater from tanks, and town water when the tanks are drained.

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    Re: First chemical test of Spa

    Quote Originally Posted by JoyfulNoise View Post
    The lithium hypochlorite and MPS can be kept. The lithium hypochlorite can be used in place of bleach in the chlorinating process but you will still need some dichlor to build up the stabilizer level. MPS is not really needed in a properly chlorinated spa and will interfere with the DPD-FAS chlorine testing. It can be saved and used in those situations where the spa had a high bather load to help oxidize bather waste faster. Chlorine is a better oxidizer than MPS but the MPS will not go bad so simply store it in a cool, dry place.
    Ok, so I can essentially start now then if I chuck the nature 2?

    We don't often have spa parties, but it's good to know that I can use the MPS if needed.

    So it seems that I need to buy some Dichlor and Bleach today. How many bottles would you recommend, seeing as it's not an average pool size?
    5900 litre or 1558 gal above ground swim spa. Approx 5 years old and heated to 37 degrees celsius year round. Cartridge filter, ozonator, Nature2 mineral sanitiser, Aqua Health non chlorine based shock, Lithium Hypochlorite dosed at each spa usage. Filled using mostly stored rainwater from tanks, and town water when the tanks are drained.

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    Re: First chemical test of Spa

    This mornings results:

    PH - 7.5
    CYA - 0
    FC - 2 ppm
    CC - 0.5 ppm
    CH - 75
    TA - 150 ppm
    5900 litre or 1558 gal above ground swim spa. Approx 5 years old and heated to 37 degrees celsius year round. Cartridge filter, ozonator, Nature2 mineral sanitiser, Aqua Health non chlorine based shock, Lithium Hypochlorite dosed at each spa usage. Filled using mostly stored rainwater from tanks, and town water when the tanks are drained.

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    Re: First chemical test of Spa

    Quote Originally Posted by Chatabox View Post
    Ok, so I can essentially start now then if I chuck the nature 2?

    We don't often have spa parties, but it's good to know that I can use the MPS if needed.

    So it seems that I need to buy some Dichlor and Bleach today. How many bottles would you recommend, seeing as it's not an average pool size?
    Some here may disagree, but the nature 2 for spas is fine to leave in. They're EPA approved to work with an oxidizer (chlorine or MPS) for sanitation, and they won't cause problems like the Nature2 pool products can. My tub is tiny though, 150gallons 2 person max. I would probably also go a traditional chlorine route if I had a tub your size.
    Helpful Links: Pool Chemistry 101 - Recommended Levels - Recommended Chemicals - FC/CYA Chart - SLAM Instructions - Pool Math
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    Re: First chemical test of Spa

    Quote Originally Posted by Chatabox View Post
    Ok, so I can essentially start now then if I chuck the nature 2?

    We don't often have spa parties, but it's good to know that I can use the MPS if needed.

    So it seems that I need to buy some Dichlor and Bleach today. How many bottles would you recommend, seeing as it's not an average pool size?
    See this post for details on how much chlorine you need for every person-hour of soaking -

    Shocking Spa..

    You can probably get away with bucket of dichlor that's just a few pounds. It doesn't go bad so if you store it properly, it will last a LONG time.

    As for bleach, you don't want to stockpile too much of it. Liquid bleach degrades over time so if you have a gallon or two around the house for laundry, that should be more than sufficient.
    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: First chemical test of Spa

    yep, only need a couple gallons, it will last awhile..

    Looking good
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

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    First chemical test of Spa

    Just purchased some Dichlor. What do I do now?

    And that link was very handy. Thank you!
    5900 litre or 1558 gal above ground swim spa. Approx 5 years old and heated to 37 degrees celsius year round. Cartridge filter, ozonator, Nature2 mineral sanitiser, Aqua Health non chlorine based shock, Lithium Hypochlorite dosed at each spa usage. Filled using mostly stored rainwater from tanks, and town water when the tanks are drained.

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    Re: First chemical test of Spa

    I'm assuming I'm putting the Dichlor in to top the chlorine levels up to around 4?
    5900 litre or 1558 gal above ground swim spa. Approx 5 years old and heated to 37 degrees celsius year round. Cartridge filter, ozonator, Nature2 mineral sanitiser, Aqua Health non chlorine based shock, Lithium Hypochlorite dosed at each spa usage. Filled using mostly stored rainwater from tanks, and town water when the tanks are drained.

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    Re: First chemical test of Spa

    Hey there, on mobile... so... use pool math ( at the bottom ) and see how much dichlor will bring your cya to 30... that is the total amount that you will use... use only enough to keep your fc at 2 daily until your total amount is used..

    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

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    Re: First chemical test of Spa

    Running some dichlor and a little PH down through the spa. About to test soon.
    5900 litre or 1558 gal above ground swim spa. Approx 5 years old and heated to 37 degrees celsius year round. Cartridge filter, ozonator, Nature2 mineral sanitiser, Aqua Health non chlorine based shock, Lithium Hypochlorite dosed at each spa usage. Filled using mostly stored rainwater from tanks, and town water when the tanks are drained.

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