Watts ZRO-4, Installation, Operation And Maintenance Manual

Annual Maintenance - Filter Kit #560032

√ Stage 1 - Sediment Filter  (PN# 104017) 

           √ Stage 4 - 10” Final Polishing Inline filter 

√ Stage 2  - Carbon Block Filter (PN# 101009)      

         (PN 560010)   

√ 1/4 Cup of common household bleach.

NOTICE:       Sanitizing of unit is recommended - RO storage tank must be drained. 

Step 1: 

 Perform steps 1 through 5 in the Six Month System Maintenance (Page 13).

NOTICE:  If not sanitizing the system, skip to step 11

Step 2:   Remove the RO membrane from its housing and rest in a clean sanitary place. (Refer 

to “Membrane Replacement” section  on page 11 for directions on removing the mem-

brane). Replace cap onto empty membrane housing and re-connect green tubing.

Step 3:   Leaving the filters out, replace stage 2 empty filter housing (hand tight) onto unit.  

Measure & pour 1/4 cup of common household bleach into the 1st filter housing (Stage 

1) and hand tighten onto unit.

DANGER

!

IF BLEACH GETS IN EYES: Hold eye open and rinse slowly and gently with water 

for 15 - 20 minutes. Remove contact lenses if present, after the first 5 minutes, then 

continue rinsing eye. Call a poison control center or doctor for treatment advice. 

Step 4:   With the RO faucet in the closed position turn on the incoming water supply to the 

system by turning the adapt-a-valve counter clockwise.  Let the unit fill with water 

(approximately 8 minutes) allowing the bleach to dilute. 

Step 5:  Let the system sit idle for 1 minute
Step 6:  Drain the system completely
Step 7:   Let the system fill again (approximately 8 minutes) and sit idle for 10 minutes before 

draining the system again.

Step 8:   Turn off the incoming water at the adapt-a-valve and open the faucet to make sure all 

the water has been drained

Step 9:   Open the membrane housing and re-install the RO membrane while making sure not to 

kink the O-rings.  (Refer to “Membrane Replacement” section  on page 16 for directions 

on installing the membrane). Tighten the cap back on the housing and reconnect green 

tubing.

Step 10:  Remove filter housings Stage 1 and 2 and empty water.

NOTICE:   Before re-installing the filter bowls back on to the system , check O-rings to 

make sure they are still in place and lubricate with water soluble lubricant.

Step 11: 

 Insert the new sediment filter (cloth like appearance) into the 1st filter housing which is 

the one on the water inlet side (green tubing from the adapt-a-valve) of the RO system 

and re-install housing.

Step 12: 

 Insert the new Carbon Block filter (White End Caps) into the 2nd housing and re-install 

housing.   

Step 13: 

 The final in-line filter is located on the blue tube between the storage tank and the RO 

faucet. Remove it by loosening the compression fittings on both ends of the filter and 

replace with new filter. (Discard used final filter after sanitizing)

NOTICE:    The arrow on the final filter must be pointing towards the RO faucet / away from 

the RO storage tank.

SANIT

ATION STEPS