I never thought of this but recently my husband hired a company to drain our swimming pool, clean it and add fresh water. Our pool has had the same water in it for over 10 years! Even with all of the chemicals put in it to kill germs, the thought of it being used for that long with the same junk in it kind of makes me sick to my stomach!
If it doesn't feel good, don't do it twice.

Boomer Queen of Shoes