Thermal Solar Blanket for sale. Used for one month last winter. Actions 8 1/4" X 8 1/4". Could be easily cut down to dimension (ie: round, oval, etc.).
Reduces evaporation of the medspa water, hence prolonging chemical life. At the exact same time ... supplying a thermal barrier that boosts performance (earns cash on heating costs:). Used, but in great health condition.