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I used a yoga mat to make hole covers. Traced the bucket circle with sharpie pen and cut with utility knife. Fits into a bucket, cheap, and simple.
We don’t get too extreme cold so for me, I would rather keep after the holes and hack away at the ice with a skimmer. Plus, staying active helps keep me warm
Been using them for years and work great. I picked up some nice black mats for short money. I just cut them squares and they work just fine, no need to go to the effort of cutting them in circles unless you want to store them in a bucket...