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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.

While you shouldn’t notice water that has an appropriate amount of chlorine in it (less than 4 parts per million), you could feel sick from drinking overly chlorinated water. Chlorine exposure can cause nausea, vomiting, coughing, and dizziness. Chronic chlorine exposure (meaning multiple or repeated instances) can make you feel like you have the flu, according to the CDC.

Generally, you do not need to drain your pool to convert it to a saltwater system. The main exception is if you have used an antibacterial agent containing polyhexamethylene biguanide to sanitize your pool, as these sanitation products do not mix well with saltwater systems. If this is the case, you will need to start fresh. You can either drain the pool or treat the existing water with a high dose of chlorine to remove the antibacterial agent. If you choose the chlorine treatment, wait several days to allow the chlorine to work before proceeding with the conversion. If you are unsure whether this applies to your pool, consult a pool technician.

It's not a good idea to drain an aboveground pool into your yard since the pool water's chemicals can harm your plants and the surrounding ecosystem. Instead, it's best to drain the pool into an appropriate sewer so it can be processed at a water treatment plant. You might also be able to drain it into your storm drain, depending on your region. Check with your city to learn about any relevant regulations.