Here's a few pics of what I've found. Each individual crystal is roughly hexagonal shaped, and were vertical in the water. I've only seen sheet ice on ponds and pool before, so this threw me for a loop a bit.
The only thing that I can think of that might have created this is possibly the rapid freeze/thaw cycles we've been through this winter. High in the 60s one day and 20s the next, along with prolonged -- for our area -- below zero temps.
Pool was covered with the mesh that you see in the pics, so that might have had something to do with it.
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