User Manual
Installation, Operation 
and Maintenance Manual
Series PWBWGAC, PWBWMZ, PWBWCAL
Filter Systems
IOM-WQ-PWBWGAC-PWBWMZ-PWBWCAL
!
 Warning
You are required to thoroughly read all installation instructions and 
product safety information before beginning the installation of this 
product. FAILURE TO COMPLY WITH PROPER INSTALLATION 
AND MAINTENTENANCE INSTRUCTIONS COULD RESULT IN 
PROPERTY DAMAGE, PERSONAL INJURY AND/OR DEATH. 
Watts is not responsible for damages resulting from improper instal-
lation and/or maintenance.
Do not use with water that is microbiologically unsafe or of 
unknown quality without adequate disinfection before or after 
the system.
Local building or plumbing codes may require modifications to the 
information provided. You are required to consult the local building 
and plumbing codes prior to installation. If this information is not 
consistent with local building or plumbing codes, the local codes 
should be followed. 
Save manual for future reference.
Refer to enclosed for operating parameters to ensure proper use 
with your water supply.
Table of Contents  Pages
Important Safety Information – Read All .......................2
Instructions Before Using..................................2
Filter Anatomy ..........................................3
Specifications ..........................................4
Feedwater Parameters ...................................4
Power ................................................4
Installation Considerations .................................4
Drain Flow Rates ........................................4
Setup ................................................5
Installation .............................................6
Controller..............................................7
Filter Operation .........................................7
Replenishing the Calcite Filter Media .........................7
Troubleshooting.........................................7
Limited Warranty ........................................8
PWBWGAC 
PWBWMZ
PWBWCAL
PURE WATER








