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Thread: Rust Spots on pea gravel concrete

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    TroyB's Avatar
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    Oct 2008
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    Rust Spots on pea gravel concrete

    As part of our pool construction, we had pea gravel concrete decking installed. In one area of the decking, we are getting rust spot formation. Here is a pic:



    The spots are too large to be re-bar or re-bar ties sticking up out of the concrete. Any idea what this may be. It has seemed to grow in size over the last few days.

    The decking is approximately 4-1/2 months old. Thanks in advance.
    - 25K Gallons, Jandy AquaPure Model Pure1400 SWG w/ AquaLink RS PDA, Jandy LXi Heater Model 400
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    - 2 X Jandy Stealth SHPM2.5 pumps (one for pool, one for waterfall), Pool Pump ~ 100 GPM in pool mode
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    launboy's Avatar
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    Re: Rust Spots on pea gravel concrete

    Is there anything above this area of the concrete? Have you gotten any rain lately?
    18' x 42" Intex Easyset Pool, with 16' x 52" deep end in the middle. Approx. 5500 Gal.
    Hayward Power-Flo LX 1 HP, 100# Jacuzzi Brand Sand Filter(Piped underground so it looks nice) 8)
    3 - 2' x 20' Solar Pool Heater Panels(roof mounted)
    Goin' on 9 summers...NOBODY thought it would last this long.
    Buried Portable Spa sharing pumps and water with pool (Almost complete project)

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    Re: Rust Spots on pea gravel concrete

    Something mixed into the concrete that wasn't supposed to be? Impurities left in the mixer & poured out with the first batch?
    12500 AGP 2HP Sand filter
    Five years on BBB & loving it!

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    duraleigh's Avatar
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    Re: Rust Spots on pea gravel concrete

    I'm not sure it's rust......I would think iron rust to be more reddish-brown.

    There's a variety of cleaners that can be tried....TSP might be my first choice.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Rust Spots on pea gravel concrete

    We have the exact same problem and the sub that poured the deck is suppose to come by in the next few weeks and fix. A mild acid solution will remove the rust, but it will come back. We think some iron was somehow in the batch. Cleaning it works fine, but in a matter of weeks it will reapper. Keep you posted on our end.
    15K gallon gunite pool and spa spillover - medium gray plaster, 2.5HP Hayward pump, Cartridge filter, Goldline Aquarite SWG, Jandy RS8, Polaris 280

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