ScaleZERO Scale Control System for Water Heaters, Evaporative Water Coolers 4½" x 20" system with 3/4" ports (7-8gpm) for larger water heaters, evaporative water coolers (can be reduced to 1/2"). System protects the water heater parts and water cooler par
ScaleZERO Scale Control System for Water Heaters, Evaporative Water Coolers 4½" x 20" system with 3/4" ports (7-8gpm) for larger water heaters, evaporative water coolers (can be reduced to 1/2"). System protects the water heater parts and water cooler par
