TROPICAL FISH LIQUID SOLAR BLANKET - Liquid Heat - Solar Pool Cover in a Bottle - Reduce Evaporation, Conserve Heat - 310mL-(Pack of 3)

how long does it last?

Does it warm a cold pool?

Can it be used with a pool heater?

If this sits on top of the water, it appears that it would just get skimmed off in the skimmer and gunk up the filter. Does it ruin any type filter?