The Hydro-Logic Flowmaster measures how many gallons of filtered water have gone through the system and alerts you when it's time to change the filter. You can program in the filter capacity and when you reach the target number of gallons, the Flowmaster beeps. Important for knowing when to change the pre-filter for the Merlin-Garden Pro. Also ensures your system runs at its peak efficiency at removing contaminants. Available in 3/8 inch quick connect for the Merlin-Garden Pro & Tall Boy and in 1/4 inch for the Small Boy. 0.2-2 GPM flow rates.
1/4 inch Flowmaster: recommended for use with smallBoy, Stealth RO100 and 150 and most low flow RO systems. Designed to operate at .01 - .5 gpm
3/8 in Flowmaster: recommended for use with TALLBoy, Merlin and Evolution-RO. Designed to operate at .2 - 2 gpm.