Perfect For Spas and small pools:  Aqua Blanket 1 Pint version
Keeps the heat in, Saves $$$ on your heating bills.
For Pools: Aqua Blanket Liquid Solar Cover works as a chemical heat retainer, offering many advantages over conventional solar covers. Perfect for getting and keeping that pool warmer - quicker!
For Spas: retains heat in the spa and significantly reduces pump running time to maintain temps
No actual cover = no messy cleanup of debris from removing cover
Proven safe formula retains heat by forming invisible layer of sun absorption
Great for people with pool heaters as well - drastically reducing running your heater and saving $
Easy to use - just pour into pool
Doesn’t affect operation of pool cleaners
3 ounces per 15,000 gallons per month for pools 
1 oz per month for hot tubs / spas