2% dosage AlkalinepH 11.5. Bi-weekly used with Bevisto W1. 5ltrs converts to 125x 2ltrtreatments. No Phenols, No Aldehydes and non-foaming. Biodegradable to OECD standards. Comes free with a W1-W2 laminated calendar so the nurse can keep record of the maintenance of the suction cleaner. A dual pH suction cleaner system is more effective than just one.