These cute tropical fish are the quick, easy way to keep your pool warmer this season -- even while you are swimming. Toss the fish in the pool, and the revolutionary liquid solar blanket inside rises to the surface. This invisible layer on your pool's surface inhibits heat evaporation with about 60% the effectiveness of conventional plastic solar blankets -- but its 100% trouble-free! Best of all, the computer operated liquid solar blanket works 24 hours a day; and it is completely harmless to skin contact and all pool surfaces, and will not adversely affect your water chemistry. Programmable for small and large swimming pools and will last up to 60 days. 2 fish per pkg.