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The best way to kill off an algae bloom in an aboveground pool is to shock it with a large dose of chlorine. Shock typically kills off algae in about one to three days, although it can take longer if the pool water is in poor condition. After the shock treatment, add algaecide to prevent algae from growing back, and test the water every few days with test strips to ensure the pool’s pH doesn’t get out of whack.

Yes, you can put too much shock in a pool, and it is crucial to follow the directions on the product you are using. Adding excess shock can upset the chemical balance, make the water cloudy, have adverse effects on swimmers, damage pool equipment or surfaces, and even encourage certain types of algae to grow. If you have over-shocked your pool, perform a water test and adjust the chemicals as necessary. The pool's chemical balance will eventually return to normal as the excess chlorine dissipates over time.

Figuring out how to clear a green pool can seem tricky at first, but it’s all about knowing which pool cleaning chemicals to use. You may think of using baking soda to help you with your algae problem, but unfortunately, it won’t help. This is because baking soda only raises your pH and alkalinity levels. 

Instead, you need to use pool shock to clear up a green pool—the shock raises the free chlorine levels and will kill the algae.

You should avoid filling your pool overnight—just as a precaution. You’ll want someone around to check on the progress. If your hose springs a leak or you overfill your pool, you could end up with some costly water damage. At worst, you could flood your home’s foundation. For this reason, ensure someone is home and awake, even if your pool takes a couple of days to fill.