solar blankets

[steve in Nova Scotia]

When using a solar blanket, do you leave you pump on with the water circulating or do you turn the pump off, I have a 20X40 inground pool and it's June 1st and the temp is 60 degrees, I need to raise the temp and was told the solar blanket will help. I was told that using a solar blanket would turn my pool water green and I don't want that to happen.
Any one have any advice on the use of the solar blanket? Are they useful or just a waste of money.

[Backglass]

Solar blankets work well to raise the temp and hold in heat, if they get sun and the ambient temp isn't cold. If it's 60 outside, a solar blanket wont raise the temp to 80.

Can you see the sun in Nova Scotia? (It's a joke!)

They are most useful to keep the pool from losing heat overnight.