Yeah, it's strange. It's something building up where water runs off after a watering. It crumbles to a fine powder if you touch it and reminds me of calcium buildup. No idea where it's coming from unless my water is much harder than the water report says it is AND my RO filter is completely useless.
Ok, I was thinking it would evaporate. Did you see my post above about the levels in my water? Curious what is acceptable levels and what would necessitate a filter.
I did thats what made me think of it. I don't know how much if any is ok to have. I would imagine it could hurt your microbes but thats a question for the Doc Im curious too, since I needed a filter anyway I just got one that removed it since I knew we had it in our water so I never asked.