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Thread: Struggling with cyanic acid and water balance

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    Matilda's Avatar
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    Struggling with cyanic acid and water balance

    Hello,
    Hoping someone can offer some clarity for me ! I've been running my hot tub for a several months and seem to be in a constant battle with chemicals and balancing the water. The main problem is slightly cloudy water and ever increasing cyanuric acid levels
    My dealer told me nothing about this and encouraged us to buy these 'best test strips'. When I asked about the CYA levels and having to drain the pool down around every 4-6 weeks they told me not to worry 'we don't really test for that or know anything about it ! This seems to be a common perception of it where I am in the UK. I wasn't really satisfied so I did some digging around and came across this site.

    It's been a real eye opener !

    I refilled the pool 2 weeks ago and CYA is already up at 100 I've read through the forums and looked at the the dichlor then bleach method but I can only seem to find sodium hypochlorite at 14-15% which says it's for pools.

    Does the bleach method damage the internals at all ? Also I've always used bleach in the house in cold water as always though that heat made it less effective ?
    I'm searching for a more comprehensive test kit and I can see the Taylor one recommended isn't available over here.

    I'm looking to buy the Lamotte one but I'm wondering whether to switch to bromine - I don't know anything about this method and wonder if it's as effective as chlorine ? Does it have any particular issues ( similar to the whole CYA/chlorine dilemma).


    I'm so fed up with constantly draining and the advice I've had so far is to add oxidiser/shock weekly/use spa clarifier/foam away - generally just buy more stuff !

    It's really getting me down and instead of being fun and relaxing it's turning out to be almost a full time job !

    Apologies for all the questions and any help much appreciated, I've been reading so much I'm getting myself confused
    I have a hotspring Vanguard spa - 5 jet seats and 1 cool seat. 1500 litres5 ceramic filters. Outdoor, sat on decking and under an open pergola. Currently using: dichlor granules. Drained every 6-8 weeks if lucky !

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    AftonJeeper's Avatar
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    Re: Struggling with cyanic acid and water balance

    Welcome to TFP!

    Not sure if you saw the spa section of the forum or not but there are two startup methods listed in there, one for chlorine and one for bromine.

    The % of sodium hypochlorite will only change the amount you need to dose the water with to maintain the proper FC level. You can use 6% household bleach or the higher concentrated "pool" bleach just make sure you adjust the percentage in pool math to determine the amount needed.

    A quality test kit makes caring for you spa easier, what ever kit you purchase make sure it has a FAS-DPD chlorine test.
    20'x48' 40,000 gal. Vinyl, Pentair Intelliflo 2 VST, Sta-Rite PLM300 System 2 Cartridge Filter, and a Pentair Mastertemp 250 heater all controlled by Pentair Easy Touch with Screen Logic. Dolphin Premier pool attendant.
    I've got iron stained well water. TF-100 and Speed Stir

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    Matilda's Avatar
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    Re: Struggling with cyanic acid and water balance

    Many thanks for replying AftonJeeper, yes I've had a browse. I'm just wondering whether switching to bromine will be as effective and easier to manage. I'm a bit worried about adding incorrect dosage with bleach with the higher concentration and I can't seem to find any 6% most of what I've seen readily available is less than 5%. I've contacted Sword shield today about the lamotte 7022 kit and they've said they no longer supply it as it doesn't comply with standards ? They also said they don't supply any FAS- DPD kits so I'm stumped as to where to find one in the uK as it seems we have limited choice here !
    I have a hotspring Vanguard spa - 5 jet seats and 1 cool seat. 1500 litres5 ceramic filters. Outdoor, sat on decking and under an open pergola. Currently using: dichlor granules. Drained every 6-8 weeks if lucky !

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    Re: Struggling with cyanic acid and water balance

    Found this:

    LaMotte FAS-DPD Commercial Series Kits | www.poolandspacentre.co.uk


    Looked on Amazon UK - Taylor Kit was almost 700BP - zoiks!
    25K Gallon In-ground Pool with Elevated Spa - Gunite, Hayward 3400VSP, 150 Pentair Cartridge Filter, Hayward In-Line Chlorinator, Zodiac MX8 Pool cleaner - TF 100 test Kit w/ SpeedStir - Space Coast of Florida

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    Matilda's Avatar
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    Re: Struggling with cyanic acid and water balance

    Thanks DAB942, I found the Amazon one. I thought the 167 was a bit on the steep side ! ha ha
    Looking like it might be the only option though.
    I have a hotspring Vanguard spa - 5 jet seats and 1 cool seat. 1500 litres5 ceramic filters. Outdoor, sat on decking and under an open pergola. Currently using: dichlor granules. Drained every 6-8 weeks if lucky !

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    cfherrman's Avatar
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    Re: Struggling with cyanic acid and water balance

    As far as clorine/bromine, try clorine first as there is more clorine users on here.
    Intex 24' x 52" Closed for 2017/18 Winter
    2 Main Drains, hard lined 1.25" and 1.5" PVC
    1/2 HP Intex Pump w/ 42 lb 13" Sand Filter

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    Matilda's Avatar
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    Re: Struggling with cyanic acid and water balance

    Thank you cfherrman, I'd like to combat the chlorine issues I've got first if I can
    I have a hotspring Vanguard spa - 5 jet seats and 1 cool seat. 1500 litres5 ceramic filters. Outdoor, sat on decking and under an open pergola. Currently using: dichlor granules. Drained every 6-8 weeks if lucky !

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    JoyfulNoise's Avatar
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    Re: Struggling with cyanic acid and water balance

    Bromine will not work any better than chlorine and bromine can have it's own problems as many bromine tablets are composed of BCDMH where they add dimethyl hydantoin (DMH) continuously to the tub. DMH causes similar problems to using too much CYA but there is no test for DMH so you only know how much you have based on keeping historical records of tablet use. So bromine is not a better solution...also, many people are more sensitive to the smell of brominated waters and some report greater skin sensitivity to it (although that is mostly anecdotal evidence). So if you don't have any problems with chlorine, stick with a chlorine tub.

    I'm not surprised that shops in the UK have no idea how to deal with CYA because it's not used much in the EU and UK pool regulations. Also, test kits can be very expensive mostly because they have to be shipped in from the US. LaMotte is your best bet for getting a usable test kit as they are a European manufacturer. In the US we use Taylor Technologies but their stuff is limited in Europe and the UK because they have to rely on distributors there....so a lot more middle-men taking their cut.

    Using bleach in your tub should be fine. As far as chemistry is concerned, bleach causes on a small net increase in pH over time while dichlor is acidic and will cause a net decrease in pH. Using bleach is safer than dichlor as it adds no stabilizer (CYA) to the water and will not cause the pH to crash. Low pH is going to be the biggest driver of damage to internal equipment in a hot tub.

    If you stick with the dichlor/bleach method in the sticky and follow the instructions there carefully, you should have no problems keeping the tub balanced. You might need to simply drain the tub now to get rid of the excess CYA and start with a fresh fill. I also suggest you look into to doing a plumbing purge to get rid of biofilm accumulation using a product called Ahh-some. If you can get Ahh-some in the UK through a distributor, it is well worth it. You can look up Ahh-some on the internet and contact them directly, they can help you find a distributor. The company owner is a TFP user (ahhsomeguy) and he will happily help out with product advice.
    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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    Matilda's Avatar
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    Re: Struggling with cyanic acid and water balance

    Thanks JoyfulNoise for taken the time to answer. Very helpful ! I'll stick with the chlorine and I've just cleaned out the pipework and in the process of refilling - not much fun on an icy December morning ha ha

    I've been reading through a number of threads but getting confused over the all the ratios but I'll keep reading until it finally goes in !

    It doesn't seem we can get the lamotte test kit anymore over here - I have found the Taylor Icare one though ? Is this any good for accurate testing. I don't really understand the difference between the FAS- DPD and just DPD ? The Icare says it tests for TC FC and CC - is this what is needed ?
    This is the kit I've found Taylor Test Kit - The Swim Store


    Edit * I've managed to find this one: Taylor K- 2006 FAS- DPD kit Chlorine swimming pool kit


    I don't think it comes with as much stuff as the 2006C kit, could anyone kindly advise me what reagents I'll need most of so I can order them with it - I don't fancy paying 60 postage each time for refills !

    Again Many thanks and much appreciated everyone
    I have a hotspring Vanguard spa - 5 jet seats and 1 cool seat. 1500 litres5 ceramic filters. Outdoor, sat on decking and under an open pergola. Currently using: dichlor granules. Drained every 6-8 weeks if lucky !

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    cfherrman's Avatar
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    Re: Struggling with cyanic acid and water balance

    Check out test kits compared, the 2006 is a smaller version of the 2006c
    Intex 24' x 52" Closed for 2017/18 Winter
    2 Main Drains, hard lined 1.25" and 1.5" PVC
    1/2 HP Intex Pump w/ 42 lb 13" Sand Filter

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    Mod Squad kimkats's Avatar
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    Re: Struggling with cyanic acid and water balance

    The difference between the FAS- DPD and just DPD-

    FAS-DPD is a powder based test. It is great as you can test your FC as high as you might need to. It is more accurate that the DPD test. If I use the DPD (a drop based test) at all it is just to tell me there is some FC in the pool.

    I would say you need more of these test as they are the ones we use daily:
    -FAS-DPD
    -PH

    I would also get more of the CYA test regent as the 2006 only gives you a couple of test worth of regent.

    I would also like you to look into this test kit:

    Total Pool Water Testing Kit, Fresh Water Clear Choice Labs

    I don't know how the shipping will be for you from them. It is worth checking into. They have proven themselves to our friends in Australia.

    Let me know if I missed a question or concern. we want you to enjoy your pool!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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