User Manual
4
Specications
Feed Water Parameters 
 Do not use this system on water that is microbiologically 
unsafe or of unknown quality without adequate disinfection 
before or after the system !
Minimum inlet pressure: 30 psig
Maximum operating pressure: 125 psig
Minimum water temperature: 34°F (1°C)
Maximum water temperature: 110°F (43°C)
Power
Voltage: 120VAC
Frequency: 60Hz
Power consumption: 7 Watts Maximum
Installation 
Location: Indoors (Protect from direct sunlight)
Minimum ambient temperature: 34°F (1°C)
Maximum ambient temperature: 122°F (50°C)
!
MODEL NO. VALVE MINERAL TANK 
SIZE
MEDIA CUBIC 
FOOT
GRAVEL 
(LBS)
PEAK SERVICE 
FLOW (GPM)*
PRESSURE DROP BACK WASH  
(GPM)
FLOOR SPACE 
L X W X H
PWBWCAL1 Time Clock 9" X 48" 1 10 5 <15 7 16" X 10" X 55"
PWBWCAL15 Time Clock 10" X 54" 1.5 10 7 <15 7 16" X 11" X 62"
PWBWCAL2 Time Clock 12" X 52" 2 30 10 <15 10 17" X 13" X 60"
PWBWCAL3 Time Clock 13" X 65" 3 40 15 <15 15 18" X 14" X 74"
*Note: Peak service flow rate is for intermittent use only and is not to be interpreted as continuous service flow rate capability. These systems are designed to treat the domestic water used in a 
single family dwelling. For irrigation water treatment or higher volume applications please contact your Watts representative.
MODEL NO. VALVE MINERAL TANK 
SIZE
MEDIA CUBIC 
FOOT
GRAVEL 
(LBS)
SERVICE FLOW* 
(GPM)
PRESSURE DROP 
(PSI)
BACK WASH 
(GPM)
FLOOR SPACE 
LXWXH
PWBWMZ1 Time Clock 9" X 48" 1 10 9 15 7 16" X 10" X 55"
PWBWMZ15 Time Clock 10" X 54" 1.5 10 10 15 7 16" X 11" X 62"
PWBWMZ2 Time Clock 12" X 52" 2 30 10 15 10 17" X 13" X 60"
PWBWMZ3 Time Clock 13" X 65" 3 40 15 15 15 18" X 14" X 74"
MODEL NO. VALVE MINERAL TANK 
SIZE
MEDIA CUBIC 
FOOT
GRAVEL (LBS) SERVICE FLOW* 
(GPM)
PRESSURE DROP 
(PSI)
BACK WASH 
(GPM)
FLOOR SPACE 
LXWXH
PWBWGAC1 Time Clock  9" X 48" 1 10 3.7 <15 4 16" X 10" X 55"
PWBWGAC15 Time Clock 10" X 54" 1.5 10 5.5 <15 5 16" X 11" X 62"
PWBWGAC2 Time Clock 12" X 52" 2 30 7.4 <15 7 17" X 13" X 60"
PWBWGAC3 Time Clock 13" X 65" 3 40 11.1 <15 9 18" X 14" X 74"
PWBWGAC4 Time Clock 16" X 65" 4 60 14.8 <15 15 20" X 17" X 74"
Drain Flow Rates - The drain system these lters 
are plumbed to must be able to accept the listed drain 
volumes for a period of 27 minutes.
Micro Z™ Filters
  9" X 48", 1 cubic ft.  7 gpm
  10" X 54", 1.5 cubic ft.  7 gpm
  12" X 52", 2 cubic ft.  10 gpm
  13" X 65", 3 cubic ft.  15 gpm
Carbon Filters:
  9" X 48", 1 cubic ft.  4 gpm
  10" X 54", 1.5 cubic ft.  5 gpm
  12" X 52", 2 cubic ft.  7 gpm
  13" X 65", 3 cubic ft.  9 gpm
  16" X 65", 4 cubic ft.  15 gpm
Calcite Filters:
  9" X 48", 1 cubic ft.  7 gpm
  10" X 54", 1.5 cubic ft.  7 gpm
  12" X 52", 2 cubic ft.  10 gpm
  13" X 65", 3 cubic ft.  15 gpm








