When you “Vacuum to Waste” you are pumping the debris you vacuum out of the pool and sending the water to the waste line, and not through the pool filter. This method removes a large amount of water from the pool in a short time so be sure the pool is full before you begin. This method is used for large amounts of debris and dirt. This method will only work for circulation systems that use a 6-position filter valve. If you have an older “Push-Pull” style filter valve you must vacuum through the pool filter. Be sure to monitor the location where the waste line is connected to the sewer system in your home, just in case the sewer line cannot handle the large amount of water and overflows.