Here are the three biggest mistakes you can make: Closing your pool: Number one: Closing your pool too early if temperatures are still above 65 degrees. Fahrenheit Algae can build up under your pool cover, so wait until temperatures cool down. Number two: Completely draining your pool. Your pool could collapse or even pop out of the ground if it's empty.

So unless you're putting your pool away after draining, keep water in it and winterize your equipment. Number three: Not cleaning before you close. If you close your pool dirty, you'll open it. Dirty and dirty.

Water can breed bacteria and algae. so clean and balance your water before you cover it. Follow us at swim! University for more pool care tips throughout the year.