Too many chemicals can damage any pool and its users, so it is recommended to add only the amount recommended by the pool chemical manufacturer. Improper use of chemicals (especially excessive use of purchased chlorine) can change the color of the inside of the pool liner. This is the same principle as when the water in public pools causes swimsuits to lose their color over time. We also recommend using an INTEX salt water system, which purifies the pool water with natural chlorine, which is gentler on both people and the pool liner.