I did some online research on the solar fish a while back. The liquid inside is also available in gallons by the company that manufactures it for commercial pool use. It has some type of propriatary material in an isopropol alcohol carrier and if there is NO disturbance of the water surface from anything (even the wind) it can help keep a couple of degrees of heat in the pool overnight. Once the water surface is disturbed the effect is lost until it is calm again. It might work for you. I decided it was not worth the money for me to try it.
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