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The average pool size in gallons is 15,360. This number is for a 16’ x 32’ pool with a four-foot depth. However, many pools have different depths at each end or irregular sizes, so you may need to use the formulas above to calculate exactly how many gallons of water you need.

Completely refreshing the water in an aboveground pool every five to seven years helps keep it free of bacteria and algae. Emptying the pool also allows you to clean, repair, or replace the pool liner. Schedule your water change when the weather is mild, as intense heat or cold can damage the pool liner when the pool is empty.

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.

You shouldn’t swim in a pool with algae. When there’s algae, there’s also bacteria that’s feeding on the algae. Also, algae-infested pool water is often chemically imbalanced, which means germs like Cryptosporidium, Giardia, and E.coli could be present. These germs can cause a range of illnesses from gastrointestinal issues, to rashes, and respiratory problems.

The best thing to do is to get rid of the algae first, test and balance the water, and then you can enjoy swimming without any worries.