2nd year pool owner, 1st year opening from winter.

Took winter cover off yesterday to find pool in a full algae bloom. Very dark green and cloudy. Barely see bottom in shallow areas. What would be the best way to treat.

Already put some algaecide in pool, and 4 gallons of 12% bleach, and 2 gallons of 10% bleach. Ran filter overnight, no change. Plus vacuumed early this morning on waste mode on filter.

Above ground pool
27,800 gals
sand filter - new sand from opening of last summer
Taylor test kit - reagents from last year but bought in August and used for hot tub over winter.
Chlorine # is higher then test kit goes which is 5
Ph 7.2
Total alkalinity 90