Also have cloudy water (with a story)

Your chlorine is still way too low, with a cya of 50 - 100 you need to bring it up to at least 10 ppms. If you want to keep it at shock to kill any remaining algae you have to bring it up to 20. This is "Ben's best guess chart

Stabilizer . . . . . . Min. FC . . . . Max FC . . . 'Shock' FC
=> 0 ppm . . . . . . . 1 ppm . . . . . 3 ppm . . . . 10 ppm
=> 10 - 20 ppm . . . . 2 ppm . . . . . 5 ppm . . . . 12 ppm
=> 30 - 50 ppm . . . . 3 ppm . . . . . 6 ppm . . . . 15 ppm
=> 60 - 90 ppm . . . . 5 ppm . . . . . 10 ppm . . .. 20 ppm
=> 100 - 200 ppm . . . 8 ppm . . . . . 15 ppm . . .. 25 ppm

You will continue to have problems with algae if your don't keep your chlorine levels high enough for the amount of cya in your water.