I am wondering how much the concrete will affect my PH. I want to build a
small stream, only 4 ft, and would like to use one 80lb bag of concrete to
set the large stones in. My pond already exists so I would not have any way
to rinse off the concrete with vinegar or anything. Is this going to be a
big problem? I would rather not use great stuff as the UV exposure it will
get will just break it down in a short time.

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Thanks,
Lisa