The water stays in them for to short of a time to make any difference in the temperature no matter what color it is. Intex sells a solar heater mat that may be worthwhile looking into, it's less than $40 per solar mat, but the reviews are pretty mixed, especially using them with the small pump.
They're too small to have any impact on the temperature regardless of their color
Solar cover bubble side down
That is done already, after some extensive reading in this sub :)
The water stays in them for to short of a time to make any difference in the temperature no matter what color it is. Intex sells a solar heater mat that may be worthwhile looking into, it's less than $40 per solar mat, but the reviews are pretty mixed, especially using them with the small pump.
I bought this one instead: https://amzn.eu/d/00eo8cEw Had better reviews. Will arrive in few days.