Hydrologic Tall Boy/Merlin Garden Pro Flowmaster 3/8″ QC Gallonage & Filter Capacity Monitor
Flowmaster 3/8″ QC gallonage & filter capacity monitor. Operates at flow rates between 0.2-2.0 GPM. Alerts you when it’s time to change your filters. For Evolution-RO1000, Tall Boy and Merlin-Garden Pro or any filter with 3/8″ fittings.