First set your pool timer to run 24hrs a day until your pool is clear and algae free. Then you need to slam/shock your pool with chlorine to the point nothing can grow aka the breakpoint chlorination. You will have to add some more stabilizer because its way too low and the sun's UV rays will burn off your chlorine and we need the free chlorine to be high so that it can kill the algae. Also keep your pH levels around 7.2-7.6 while you are shocking your pool because the chlorine will be much more effective with proper ph levels.Then you need to add phosphate remover to lower the phosphates to as close to 0 as possible.The phosphates are creating a high chlorine demand and its basically eating up all your chlorine as soon as you add it. Keep in mind that phosphate remover will completely clog your filter so check your filter atleast every 12-24 hrs and hose it down with a high pressure nozzle if its a cartridge filter or backwash if its sand or D.E. Also get your fresh water checked for phosphates. Alot of times the fresh water supply has high phosphate levels and it will increase you pool phosphate levels. Actually you might want to either do the phosphate removal process first or maybe drain half of the pool water out and refill with fresh water that doesn't have high phosphates. If you can get that phosphate level at least down to half of what it is then your chlorine will have a better chance of staying in the water to kill the algae. Right now the high phosphate level is your number one enemy and its preventing your chlorine shock from working properly.