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Thread: Cannot Clear Cloudy Water

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    Cannot Clear Cloudy Water

    If I let the FC level in my hot tub go to zero for a couple days, the water will become cloudy and become even cloudier very quickly (like a bacterial bloom). No problem - I just keep adding a bit of bleach every couple days and a bit more bleach after every use, and this keeps it in check.

    However, just recently, the water turned a bit cloudy and has stayed a bit cloudy, despite shocking with bleach and even using a flocculant (Bright & Clear). Over the past 3 days, it has remained cloudy, despite my best efforts.

    I'm going to drain and refill, but just wanted to see if anyone had any thoughts about this. The water is about 5 months old. I know this is longer than recommended, but the usage has not been that high. I have tracked bather hours pretty closely, and according to guidelines and calculations, we should still be ok. But, in any case, maybe the water is just old, TDS is too high, or whatever, and therefore, it just won't get crystal clear with any chemical additions anymore.

    The other alternative explanation is a bit stranger. I brewed beer a week or so ago, and as part of that process, I run water through the hose and into a copper coil which is immersed in the proto-beer to cool it before fermentation. The water coming out of the copper coil is hot, so I figured, why waste it? I let the hot water flow into the hot tub until it was at max fill, then let the rest go into the yard. So is it possible that enough copper was released from the inside of this coiled tubing to discolor the hot tub water? Could the copper ions be reacting with something else in the water to cause this greenish cloudiness? It seems very unlikely to me, but thought I better ask...

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    Mod Squad tim5055's Avatar
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    Re: Cannot Clear Cloudy Water

    I just think you have something growing in the water when it goes cloudy. How old is the tub and have you ever given it a good Ahh-some cleaning?
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Mod Squad pooldv's Avatar
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    Re: Cannot Clear Cloudy Water

    Agreed, get some ahh-some and drain it. I've been using bleach in my hot tub for 18 months and we're very happy with it. Here is the process we use:

    How do I use Chlorine in my Spa (or pool)?
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    Re: Cannot Clear Cloudy Water

    I presume that you used Dichlor initially and also for one day per month to maintain the CYA level, right? If not, then maybe the CYA level got too low and the chlorine is too strong and getting used up and outgassing too quickly. That would cause the periods of zero chlorine which allow bacteria to grow and cause cloudiness.

    As for a more persistent cloudiness, I suspect that has more to do with not having good filtration. Check your filters for tears or whether they need to be cleaned. The other possibility would be if your pH, TA and CH were too high in combination for over-saturating the water with calcium carbonate. If you lower the pH and the cloudiness dissipates, then that could be the problem.
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    Re: Cannot Clear Cloudy Water

    Test

    - - - Updated - - -

    Sorry, the forum system keeps throwing my responses away...loathe to write any more long answers that get trashed...

    So, yes to CYA - still above 30ppm.
    Stopped using filter cleaner a few months ago when I ran out - just cleaning with the hose. Could that be it?
    pH=7.6; TA=70; CH=200

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    Mod Squad pooldv's Avatar
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    Re: Cannot Clear Cloudy Water

    Forum should be all fixed now.

    I don't think that CH is high enough to cause cloudiness or the filter cleaner. More likely it is insufficient chlorine.
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    Re: Cannot Clear Cloudy Water

    Bleach normally clears it, but did not this time. Perhaps dichlor would have done so, but I just dumped and refilled. Since then, the water has been back to sparkly clear.

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