go to the store and buy some 8.25% Chlorox Concentrated liquid bleach. At Sams club it was about $12 for a box of three. Get about 4 boxes or 12 bottles. Then get 60% Algecide. one bottle will do but get two. It should say in the contents, "poly.........".

DON'T put it in yet! Brush the sides (at least twice) and the entire bottom. Backflush your filter until the glass is clean and then twice as long.
When it is dark, NOT BEFORE, put in the algecide, twice what is on the label. Wait 45 minutes. put in enough bleach to raise the level to 20ppm FREE chlorine.
In the morning you WILL have dead alge in the bottom of the pool but it will be brown. Sweep the pool to waste and add water as you are sweeping.
Brush again. Wait until dark again, repeat algicide and bleach but half as much. May need to brush again on Friday. A lot of work BUT....this works. Don't let anyone in the pool while you are doing this as the chlorine level will be too high.

Good Luck.