March and 70 degrees! Remember: when temperatures of 60 degrees or higher remain constant, you should start treating your swimming pool to prevent green algae. Either undo a couple of springs, or if you have a mesh cover, pour through the cover, 2 gallons of liquid shock. If you choose to pour through the cover make sure to hose it down thoroughly.
Also add in one gallon of algaecide. If you are not opening your pool until June it is recommended to use 1 gallon of algaecide every month until that time, and then 1 gallon the week prior to the opening.