5% dosage AcidicpH 0.65. Bi-weekly used with Bevisto W2. 5ltrs converts to 50x 2ltr treatments. 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.