A few years back, when I was less attentive to pool chemistry, I got one of those bubble-type floating covers in the hope that it would minimize evaporation (it gets really hot here). Three days after placing it in the pool, I discovered the worst algae bloom of all time. I immediately removed it, dealt with the algae, and stored the cover. I'm still not clear about the relation between the cover and the bloom, if any, although it seemed like more than coincidence. I'm thinking about trying the cover again this summer. Any thoughts on how to avoid a similar occurrence?