I've searched and not finding anything, I'm coming to the experts for advice. We've not closed our pool in the past three years because we really only get below freezing weather about one or two weeks of the year and those days aren't contiguous. However, we fight leaves and debris every year. So this year we thought we'd throw a cover over the water, still not closing the pool. We purchased a light weight custom cover last year but I disagreed with my husband about using it so we didn't. His idea was to cut it to fit inside the pool and have it float over the water. I wanted to use water weights. I expressed my concern this year and think I've won the discussion. My concern being one of our feral cats thinking they could walk across the cover and falling under the cover and getting trapped. Anyway, would any of you fine people give me review or advice concerning use of water tubes to weigh down the cover? Thanks in advance.