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Thread: Treasure hunt??

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    Treasure hunt??

    The kids love to play treasure hunt with a handful of pennies. I noticed today some pinkish spots here and there on the floor of the pool. I am wondering if they are from the pennies or some kind of algea. I remembered reading that copper affected/was a bad chem in the pool. The FC was pretty low today, I immediately added enough chlorine to bring the FC to 6 and will shock it tonight just to make sure but does anyone actually know what it is? I couldnt scrape the spots off or anything, they seem like a stain.
    16x48 inch Intex pool,6000 gallons, 1000gph pump, TF-100test kit.

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    duraleigh's Avatar
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    Re: Treasure hunt??

    Little, if any copper left in pennies. It's probably a rust spot.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Treasure hunt??

    After 1982 pennies are copper-plated zinc (97.5% zinc, 2.5% copper). The copper is unlikely to get oxidized by the chlorine very quickly, but if the penny was already corroded with exposure to the zinc, the zinc can corrode much more quickly (in days).
    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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    Re: Treasure hunt??

    Quick note, the kids dont leave the pennies in there, they play with them and then bring them out when they get out. Still think it might be the pennies? The numbers are good (according to pool school) and the water is clear and clean. Just a little nervous.
    16x48 inch Intex pool,6000 gallons, 1000gph pump, TF-100test kit.

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    Re: Treasure hunt??

    Very unlikely to be the pennies.
    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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    Re: Treasure hunt??

    I wouldn't think that it is copper. Copper can form a red or pink copper(I) oxide (Cu2O), but I don't think that I have ever seen it in a pool. Copper would normally be green or black. If it really is pink, and not orange, then I would suspect pink algae, which is actually a type of bacteria.

    Sometimes bacteria (Streptomyces rubrireticuli), fungi (a Penicillium species) or chemicals under a vinyl liner can penetrate through the liner and cause stains.

    Another possibility is manganese, which can create pink or purple stains. One source of manganese is potassium permanganate (manganese greensand) filters used to remove iron or hydrogen sulfide.

    If shocking and brushing don't help, you could try putting some ascorbic acid on the stain to see what happens.

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    Richard320's Avatar
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    Re: Treasure hunt??

    I'd grill those kids and see if someone was eating redhots or hot tamales or sweettarts or some other candy largely made of sugar and food coloring near the pool.

    Koolaid turns their lips colors, and the whole package weighs about the same as 2 or 3 pieces of candy!
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Treasure hunt??

    Still not sure what it is exactly but the cl and ph are perfect and the water is crystal clear, feels great. I cleaned the filter and vacced the pool yesterday. I shocked the pool last night. They dont appear to be spreading or doing anything at all really. I will just keep an eye on things. Funny, the idea about the candy though, they would surely love it if they had that easy access to candy but they are still little enough for me to have a measure of control over that.
    16x48 inch Intex pool,6000 gallons, 1000gph pump, TF-100test kit.

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