Stabilizer is a two-edged sword. Don't have any and your chlorine can be absorbed in as little as 15 minutes in direct sun. Put too much in and unless you keep chlorine high enough algae can still take hold.

For most of us stabilizer levels can be anywhere between 30ppm (really the miniumum you should have) to 80 or 90ppm (usually for people with salt water chlorine generators).

Carl