Imagine your beautiful new pond just reached full pool for the first time. It looks fantastic but....first time you put fish in they all die! frown I think of it this way... Since your not sure what the stuff is, don't take the risk unless you get it analyzed so you know for sure. As a minimum, I'd get a sample of the stuff and throw it in a bucket of ground water from the pond site and see what happens to the PH...maybe toss in a couple of small BG as well. It may be inexpensive now, but I'm thinking it would be a very expensive problem to fix if things go wrong.

Just my 1 cent...

Last edited by Bill D.; 12/10/18 08:13 AM. Reason: after thought

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