That's funny that you brought this up....because I've been picking up about 25gallons a week at...........I'M certain it's the same place you described and I have been noticing cyano on my sand too....
I bet this is the reason for the unwanted cyano popping up. I've been scratching my head about it for a few weeks now.
Thanks for posting.
Dang, I really need to get an RO unit already!



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I'll bring some of that water by.
