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Thread: Water Runoff Toxicity from New Concrete

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    Water Runoff Toxicity from New Concrete

    Anyone know what the effects are to plants (grass & young trees/shrubs) with regard to water running off of new concrete?
    The water appears amber/green and is very "slimy" to the touch which means the pH is on the base side (probably 2 - 3 if I guessed). It is highly irritating to the skin.

    Have approx 1000 sq ft of concrete pool patio that collects in the middle and runs off to one end into my grass right near a new tree.
    The earth worms hate it and make a mad dash away from the area.

    Any info is helpful, thanks!
    20K gal pool, 2K gal spa, 3 HP Pentair 3050, Quad D.E., 400K BTU, 280 Polaris

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    Mod Squad JohnT's Avatar
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    Re: Water Runoff Toxicity from New Concrete

    Low pH is acidic, but you are correct that concrete is basic. 12 or 13 if my memory serves me. Any effect is going to be very temporary.
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    Re: Water Runoff Toxicity from New Concrete

    My bad (basic is on the high end, thanks for the correction) http://en.wikipedia.org/wiki/Ph_scale

    I would not expect to see this once the concrete has cured. Furthermore, it will get a Kooldeck coating anyway.
    Nevertheless, I am just concerned during construction phase.
    20K gal pool, 2K gal spa, 3 HP Pentair 3050, Quad D.E., 400K BTU, 280 Polaris

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