Every year when the spring rains start, our solid cover collects water and the birds turn it into a Roman bath and toilet.
Also in the past, ducks swim in the pool whether covered (when there is water in the cover) or uncovered. (Do regular birds swim/float or just ducks?)
Right now the water is still a huge ice block and temp is not much over freezing but thawing nicely. I assume the weather here will warm up eventually. I could start filling and then running the pump this April till its time for start-up in mid to late May.
Looking for people's opinions: leave cover on and have a terrible time cleaning bird dodo off, or uncover and skim wind-blown stuff out of the water till start-up in May?