Feel free to ask any questions you have. Let me know if the stains don't come off right away with the ascorbic acid, because there is more you can do if they don't. Just keep the pump on cirulate and let me know. Most of the time the ascorbic acid is enough - sometimes the stains are more embedded and need a little help, so don't worry if they don't come right off. Just be sure to add enough sequestering agent, and don't worry if the water gets cloudy - it will clear up.