CelticDaddio, Chemgeek and Dawndenise have given you the answers you asked for, but I'll add two things
1) Brush the pool to help expose the algae (espesially in the 'nooks and cranies') to your lethal dose of chlorine - it'll speed things up a little and make sure you kill it all.
2) A 'noodle' hanging into the pool and secured to the deck will allow the 'monks an exit (if they can swim well enough to get to it ), if not they stand a chance to be mentioned in the 'Darwin Awards'
Welcome to the forum, as you can see from this thread, there are people here that want you to have a 'hastle-free' pool! - Waste