A. O. Smith Water Filter Replacement Manual

AO-RO-RM-R Membrane Replacement

For use with AO-US-RO-4000

Fresh filters, obsessively engineered to provide you with clean water. Take a few minutes. Change your filters. Whatever your water need - enjoy the next round of clean water. If you need help or have a question, A. O. Smith has you covered. Contact them at 877.333.7108.

Instructions:

1. Step 1: Preparation
   Turn off the cold water valve under the sink. Release the pressure from the system by turning on the filtration system faucet. Once no water is coming from the faucet, you are ready to change the filters.
2. Step 2: Disconnect Old Hose
   Disconnect the 1/4" red hose from the drain port on the membrane filter elbow. Push down on the collar while pulling the plug with your other hand. Remove and discard the old flow restrictor.
3. Step 3: Remove Old Membrane
   Remove the membrane cartridge from the system by rotating the sump counter-clockwise (to the left) and pulling it down.
4. Step 4: Discard Old Cartridge
   Discard the old membrane cartridge responsibly.
5. Step 5: Prepare New Membrane
   Take the new membrane cartridge from its packaging and remove the protective cap from the head of the membrane.
6. Step 6: Install New Membrane
   Attach the new membrane cartridge to the bottom of the top housing, ensuring all connection points are aligned. Push the top of the sump up into the bottom of the top housing and turn the sump clockwise (to the right) to lock it securely.
7. Step 7: Reconnect Tubing
   Insert the new flow restrictor into the red 1/4" tubing. Push the red tubing into the drain port elbow on the membrane filter. ⚠️ Important: Ensure the red tube and elbow are inserted all the way.
8. Step 8: Purge System
   Open the cold water valve. Purge the system by opening the RO faucet and letting water flow through the system for 24 hours.
9. Step 9: Check for Leaks
   Once the system has been purged, turn off the RO faucet. Allow 2 hours for pressure to build up in the system and carefully check for leaks. Your RO system is now ready to use.

NSF Certification

Tested and Certified by NSF International against NSF/ANSI Standard 58 in model AO-US-RO-4000 for the reduction of specified contaminants. Conforms to NSF/ANSI Standard 58 for substances listed on the performance data sheet. See performance data sheet for individual contaminants and reduction performance at www.nsf.org.

Rated capacity: 12 months depending on contaminant levels & usage. Systems certified for cyst reduction may be used on disinfected waters that may contain filterable cysts.

For use with municipally treated water only. Do not use with water that is microbiologically unsafe or of unknown quality without adequate disinfection.

AO-RO-RM-R Remineralizer Replacement

For use with AO-US-RO-4000

Fresh filters, obsessively engineered to provide you with clean water. Take a few minutes. Change your filters. Whatever your water need - enjoy the next round of clean water. If you need help or have a question, A. O. Smith has you covered. Contact them at 877.333.7108.

Instructions:

1. Step 1: Remove from Packaging
   Remove the remineralizer from its packaging.
2. Step 2: Preparation
   Important: Close the cold water valve under the sink. Open the filtration system faucet to release system pressure. Once no water flows from the faucet, you are ready to change the remineralizer.
3. Step 3: Disconnect Hoses
   Once the tank is drained and the system is no longer under pressure, remove the 3/8" hose from both the inlet and outlet of the remineralizer. Push and hold down the collar while removing the hose.
4. Step 4: Discard Old Remineralizer
   Discard the old remineralizer cartridge.
5. Step 5: Connect Faucet Hose to Outlet
   Insert the white 3/8" hose attached to the faucet into the outlet connection of the new remineralizer. Press the hose in until it stops.
6. Step 6: Connect RO Manifold Hose to Inlet
   Connect the remaining hose end (which is connected to the RO manifold outlet labeled "Faucet") to the inlet portion of the remineralizer. Press the hose in until it stops.
7. Step 7: Fill RO Tank
   Turn off the filter faucet, then turn on the water supply. Allow the RO tank to fill up completely, which may take around 2 hours.
8. Step 8: Inspect for Leaks
   Once the tank has completely filled, carefully inspect for leaks.
9. Step 9: Flush Filters
   If there are no leaks, flush the filter cartridges by turning on the RO faucet and allowing the water to run through the filters until there is no pressure coming out of the RO faucet.
10. Step 10: System Ready
    Turn off the RO faucet. Allow 2 hours for pressure to build in the system. Your RO system is ready to use.

Important Notes:

⚠️ IMPORTANT: For the first 36 hours after initial installation, periodically inspect for leaks while the system is running and when it is turned off. If a leak occurs, shut off the water supply, open the filter faucet to release pressure, and contact A. O. Smith Support at 877.333.7108.

AO-4000-CARBON Carbon & Claryum® Replacement

For use with AO-US-RO-4000

Fresh filters, obsessively engineered to provide you with clean water. Take a few minutes. Change your filters. Whatever your water need - enjoy the next round of clean water. If you need help or have a question, A. O. Smith has you covered. Contact them at 877.333.7108.

Instructions:

1. Step 1: Remove Plastic Wrap
   Remove the plastic wrap from the replacement filter cartridges.
2. Step 2: Preparation
   Turn off the cold water valve under the sink. Release the pressure from the system by turning on the filtration system faucet. When no water flows from the faucet, you are ready to change the filters.
3. Step 3: Remove Sumps
   Remove Stage 1 and Stage 3 sumps from the filtration system by rotating the sump counter-clockwise (to the left) and pulling it down. ? Tip: Have a towel ready to catch any water that drips.
4. Step 4: Separate Sump and Remove Cartridge
   Hold each cartridge sump over the sink. Separate the two pieces of the sump by turning the bottom portion counter-clockwise (to the left). Pour excess water down the drain. Pull down on each cartridge to disconnect the filter cartridge from the top half of the sump.
5. Step 5: Install New Cartridges and Reattach Sump
   Insert and connect each new filter cartridge to the top half of the sump. Reattach the bottom of the sump to the top half by turning clockwise (to the right) and tightening. Insert the cartridge with clear netting into the Stage 1 sump. Insert the cartridge with blue netting into the Stage 3 sump.
6. Step 6: Reattach Sumps to Housing
   Reattach each sump to the top housing. Ensure all connection points are aligned. Push the top of the sump up into the bottom of the top housing and turn the sump clockwise (to the right). Ensure the sump is fully attached and locked into Stage 1 (on the left) and Stage 3 (on the right).
7. Step 7: Fill Tank and Initial Water Flow
   Once both filter cartridges have been changed and sumps are securely attached, slowly turn on the cold water valve. Confirm the filtration system faucet is closed. Allow the tank to completely fill, which may take around two hours.
8. Step 8: Inspect for Leaks
   Once the tank has completely filled, carefully inspect for leaks.
9. Step 9: Flush Filters
   If there are no leaks, flush the filter cartridges by opening the filtration system faucet and allowing the water to run through the filters until there is no pressure coming out of the filtration system faucet.
10. Step 10: System Ready
    Close the filtration system faucet. Allow two hours for pressure to build in the system. Your filtration system is ready to use.

Important Notes:

Do not use tools other than the undercounter wrench provided with the original system to remove or tighten sumps. Over-tightening can cause damage and result in leaking.

NSF Certification

The AOS-4000-CARBON filter is Tested and Certified by NSF International against NSF/ANSI Standard 42 for material safety only. The AOS-4000-CLARYUM® post-filter is Tested and Certified by NSF International against NSF/ANSI Standards 42, 53, 401 and conforms to NSF Protocol P473 in model AO-US-RO-4000 for the reduction of claims specified on the Performance Data Sheet and at www.nsf.org.

Conforms to NSF/ANSI Standards 42, 53, 401 and NSF Protocol P473 for specific performance claims. See performance data sheet for individual contaminants and reduction performance.

Rated capacity: 365 gallons (1,382 liters). Systems certified for cyst reduction may be used on disinfected waters that may contain filterable cysts.

For use with municipally treated water only. Do not use with water that is microbiologically unsafe or of unknown quality without adequate disinfection.