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Thread: Progress with Stains

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    Ray Mondo's Avatar
    Join Date
    Jan 2010
    Location
    Brisbane, Australia
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    22

    Progress with Stains

    Hi All,

    This is a follow-on from my previous posts about stains on the walls of my pool.
    After searching all over I decided that the only way I could get a bulk quantity of chlorine, unmixed with stabiliser, was to buy 25 litres of liquid chlorine from a local pool shop. They were unable to tell me the concentration but recommended that I put the whole lot in. I did so and it raised the FC to the recommended 'shock' level. I kept the SWG running to maintain it there in the hope that it would bleach the stains. No such luck.

    I decided that, when all else fails, there's always brute force and ignorance so I tackled it with a wire brush. Nothing else would touch it. I had to attach the wire brush to an old broom handle in order to reach the lower part of the pool walls. The weather has been hot and humid so I have been hopping in the pool several times a day. Each time I scrubbed a bit more off and now it's looking pretty good.

    I will now maintain my chlorine levels around the 3 to 5 mark and hopefully that will stop it re-forming.

    Today's results:
    Temp = 24C (on the way down from 27-28 over summer)
    pH 8.0 so I added 250ml of acid
    FC = 3
    TC = 3
    TA = 100
    CH = 150
    CYA = 40

    Any comments appreciated.

    Cheers,

    John Tennnock
    48,000 litre outdoor in-ground pebble/plaster pool; EAQUIP self-cleaning saltwater chlorinator and controller; Waterco S-800 Sand Filter (420 litres per minute capacity); Aquanaut Pool-Vac cleaner.

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    Join Date
    Jan 2009
    Location
    Cupertino, CA
    Posts
    1,966

    Re: Progress with Stains

    For measuring bleach/liquid chlorine concentration, you can put 1ml bleach in 10 liters (or litres) clean chlorine-free water (that is, 1:10,000 dilution), mix well, and test the FC; it will equal the % hypochlorite in the bleach.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

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    polyvue's Avatar
    Join Date
    Aug 2009
    Location
    Sacramento, California USA
    Posts
    1,215

    Re: Progress with Stains

    Quote Originally Posted by Ray Mondo
    This is a follow-on from my previous posts about stains on the walls of my pool.

    I decided that, when all else fails, there's always brute force and ignorance so I tackled it with a wire brush. Nothing else would touch it. I had to attach the wire brush to an old broom handle in order to reach the lower part of the pool walls. The weather has been hot and humid so I have been hopping in the pool several times a day. Each time I scrubbed a bit more off and now it's looking pretty good.

    I will now maintain my chlorine levels around the 3 to 5 mark and hopefully that will stop it re-forming.
    Hi John,

    Welcome back. Not algea, then? If you weren't able to diagnose the stains, you did better, by getting rid of them. Did you use acid or any type of cleaning agent or just the wire brush?

    The numbers look good. If you continue to maintain the pool's balance as reflected in your test results your pool will stay in good shape. Of course, we're saddened to hear about your pool water's declining temperature (smirk, smirk). Better get that last swim in! A number of folks here are ready to see the last of snow and ice (or cold rain and humidity) and want to swim. You'll let them, won't you?

    One hemisphere's loss is another's gain.

    Greg
    14,555 gal in-ground 16'x29' white plaster Pool w/spa (2007); Goldline Aqua Logic AQL-PS-8 control w/Aqua Cell 15 Salt Water Chlorination (SWCG); Hayward TriStar 1HP (1.85 SF) main / 1.5HP (1.60 SF) spa pumps; Hayward Swimclear cart filter C4025, ColorLogic LED lights; Tankless SP-18-4 electric heater; Polaris 280 cleaner.
    __
    View of spiral galaxy in Ursa Major NGC6217 - Hubble Telescope 2009

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