Took a chunk of what was deposited on my lawn and let it melt out in a 5 cup (about 1 litre) container and then poured the result into a couple of 500ml bottles to see how it settles out. Some sort of foam settled on the top with multi layers of who know what under and then after 24 hours got all the sediment in the bottom with discoloured water on top.
Now you have to water one of your houseplants with this water. According to what the experts at the municipality tell us your plant will turn brown and then, just like Jesus, rise up after three days and turn green again. Hallelujah!