PumpguardTM. Soak for 2-3 min and rinse with fresh water. PUMPGUARDTM pump maintenance solution is available in three sizes: 4 oz. ---------Impeller/Volute Treatment ------------------Item # 03905 32 oz. -------Soak/Dunk & Impeller treatment-----------Item # 03907 128 oz. -----Commercial Size --------------------------------Item # 03909 Do not allow standing water to freeze in pump. 18.5’ ZG026 Rev.