I bought 2 of the normal fish to cover my 750sqft pool. They went in last night. Pool has been open 2 days. (it is crystal clear and balanced as of last night) Last night I had a 4 degree overnight drop. Previous night was 6 degress. Not scientific, but that makes it better if it lasts. I'm going to watch it for the next could of weeks and see if makes a difference. The kids won't care if I can just get the temp over 70. It was 66 yesterday afternoon. It was 62 this morning. I'm getting about 9-10 degree rise a day for now. If I can keep the weather gods from causing a serious temp drop during the days here in VA I should be over 70 this weekend. Needs to be closer to 80 before I'm getting in, but I'll let the boy and his friends in this weekend if it goes over 70.

I don't want to mess with a cover and figure I will only need to mess with the fish in May and September. Once completed in August the pool was plenty warm enough to not even need a cover (consistently 85+). I expect June and July to be the same. $40 a year to extend the season a week or two is worth it to me if it works. If it doesn't work next year and in the fall I save the money.