Instruction Manual
3/8” FLOW MASTER Digital Flow Meter Manual
Step 1: 
Install 2 AAA Batteries 
 as shown in drawing
Step 2: Install Flowmaster on the 
     product (purified water) line. 
     Cut tubing and push firmly 
     into fittings. 
Programing the Flowmaster: 
 Filter Capacity   Gallons 
2. There is a possibility of 
 programming 6 dierent 
 lter capacities. Use only
 lter position #1 for this
 application. 
**** PLEASE NOTE ****
1. You only have 5 seconds
 between each step, or the 
 screen will go blank. 
1. Press the “Filter” button to light up the LCD screen. The dot should be under filter position 
 #1. If it is not, push the “Filter” button until the dot is under #1. 
2. Program the metering units: Using a small sharp pin or something similar, lightly press the
 setting button located above the top right corner of the screen. Press the “Filter” button to toggle
 through the four possible metering unit modes. For filter capacities with four digits, set the units 
 to “gallons”. For filter capacities with five digits, set the units to “gallons x 10”.
3. Program the filter capacity: After programing the units, press the “Setting” button to toggle
 through each of the four digits, and set each of the four digits according to the table above. 
 Press the “Filter” button to increase the number from 0 to 9 while the LCD screen is flashing. 
4. The Flowmaster will memorize the setting automatically after pausing for 5 seconds. 
5. Note the four bars on the left hand side of the screen which show that the setting was stored 
 sucessfully.
6. There is an option to program the “Monthly Lifetime Setting”. However, this application does
 not require this option. PLEASE SKIP THIS SETTING. 
7. Resetting the unit:  After the filter capacity has reached it’s set life, a buzzer will sound to 
 alert the user to replace the filter. After replacing the filter, press the “Reset” button. The 
 accumulated number of gallons will be reset to zero and a new filter life begins. 
Merlin-Garden Pro  1,500
Merlin-Garden Pro w/ Tall Blue 4,500
Merlin-Garden Pro w/ Tall Blue w/ KDF85 Filter 9,000
Evolution-RO1000 2,000
Evolution-RO1000 w/ Pre-Evolution 7,500
Tall Boy 7,500
Tall Boy w/ KDF85 Filter 15,000
- See Reverse -
PURIFICATION SYSTEMS
For Use With: Evolution RO1000, Merlin Garden Pro, TallBoy, Tallboy w/ KDF


