ProSystems SIZE 1.0, Owner'S Manual

INSTALLATION INSTRUCTIONS CONTINUED FROM PAGE 5

• Connect the raw water pipe to the INLET pipe connection of the bypass valve. When looking at the 

front of the unit, the inlet is the pipe connection on the LEFT side of the valve.

• Connect the treated water pipe to the OUTLET pipe connection of the bypass valve. When looking at

the front of the unit, the outlet is the pipe connection on the RIGHT side of the valve.

• Install the brine line to the brine tank.

8. TURN ON THE WATER AND TEST FOR LEAKS AND FLUSH THE PLUMBING

• Before turning the water back on place the system in the bypass position, then close all of the faucets

except one cold water tap from a bath tub.

• Turn the water on slowly and allow the water to flow out the bath tub for several minutes to remove 

any dirt, solder, glue, etc. from the plumbing system.

• Once the water runs clear, turn the bypass valve handles to service position and allow the water to fill

the system. It is common for the first few gallons of water to show some color ( orange to brown) for

a few minutes. Once the water runs clear shut off the bath tub.

• The system will now pressurize, allowing you to check for any leaks.

9. FLUSH THE REMAINING HARD WATER FROM THE PLUMBING

• To flush the remaining hard water from the plumbing, turn on all the faucets in the house and flush

the toilets (approximately two to three minutes per faucet.)

• To empty the hot water heater of untreated water, run hot water in the bathtub, until the water tests

soft.

11. INSTALL THE DRAIN LINE AND AIR GAP (AIR GAP NOT INCLUDED WITH THE UNIT)

• Using the supplied drain line fitting use Teflon tape on the threads and attach to the top of the valve.

Run 1/2 inch I.D. flexible drain line tubing ( not supplied) to an appropriate drain. Most local codes 

require an air gap. See pictures below. 

Note: Drain line may be plumbed with rigid pipe or PEX, If required by local code. The drain

connection on the valve will accommodate any standard 3/4 inch NPT fitting. 

•If you wish to use an air gap device (not included) you may purchase one from the Order Department.  

6

1/2 " DRAIN LINE

FLOOR DRAIN

GAP-A-FLOW AIR GA

"Mr. Drain"
AIR GAP

STAND PIPE 
FOR
WASHER, ETC

DRAIN
STACK

Air Gap_Floor Drain

Part Number: 13142

Air Gap_Mr. Drain,

Part Number: 14199

Standard Air Gap