Too many chemicals can damage any pool and the user, so it is recommended to add only the amounts recommended by pool chemical manufacturers. Improper use of pool chemicals (especially overuse of store-bought chlorine) can discolor the inside of the pool liner. This is the same principle that causes water in public pools to cause swimsuits to lose color over time. We also recommend using an INTEX saltwater system, which purifies the pool water with natural chlorine that is gentler on both people and the pool liner.