You need to get chlorine in the pool ASAP before you grow another large crop of algae. The dead algae on the bottom isn't going to bother it--continue to vaccuum it to waste, and it will eventually go away (keep your filter on 24/7, too). Need to know numbers for Cl, CYA, pH, and TA in order to tell you how high the Cl needs to be to kill the current bloom, but you do definitely need to shock the pool.

Janet