BioGuard's New Pool Opening Complete is the perfect way to get swimming pools off to a great start for the swimming season. This special variation of the Pool Complete family is designed to work effectively in opening conditions and quickly clear swimming pool water of any winter filth. 3-in-1 Concentrate Swimming Pool Opening Formula Cleans the swimming pool water. Turns water amazing clear and removes winter fifth. Directions for use: Make sure all swimming pool equipment is working properly, including the pump, filter, skimmer and heater. If needed, backwash and/or clean the filter according to manufacturer's directions. At Pool Opening: 1. Shake well before using. To help clear water and make opening easier, apply BioGuard Pool Opening Complete at a rate of 1 Quart per 20,000 gallons of swimming pool water. 2. Apply slowly and directly into the swimming pool water while walking around the deep end of the swimming pool. 3. Allow the swimming pool pump and filter to operate for at least 12 hours after application.