BioGuard SoftSwim C is a powerful clarifier and oxidizer that helps keep the sparkle in your water longer by removing contaminants that can cause cloudiness. It is step 3 of the SoftSwim program. This product is formulated to last 30% longer in the water - a real money saver. It clears pool water by eliminating body oils, perspiration, and other undesirable contaminants that can affect clarity and sparkle. SoftSwim C has a built-in stabilizer to ensure that the dual action chemicals won't burn off easily in hot weather.