Well let me start by saying that its going to take a bit of time to clear up the cloudy water, longer than 48 hours. You are right as well, you don't want to overdo your clarifier. How old are you cartridges? If they are getting up there, check for broken bands, or hole in the pleats. I also think the best product on the market for dead algae is Natural Chemistys pool first aid. This is an enzyme, rather than a Polymer (clarifier) so instead of making the particles stick together, it will help by eating away at the particles. Or in worst case scenerio, use a product called flocculant (floc for short) this will make the particles heavier, which will cause them to sink to the bottom of the pool (usually works in about 12 hours, I tell customer to put it in before bed) then you just vaccuum it up. Be forwarned though that you will be cleaning your cartridges a lot during this process so it can be little tedious. That is the fastest way there is to clean up coudy water. Remember to always brush the sides of your pool weekly to prevent the algae, and shock it weekly as well. Good luck!