Semi-Annual Tank Maintenance

• 1). Turn off the water supply line needle valves, close the ball valve on the tank, and open the RO (reverse osmosis) faucet, thus allowing the system to depressurize for several minutes. Unplug the transformer from the outlet.
  
  
• 2). Remove the filter housings. Rinse them with water and soap, and dispose of used filters.
  
  
• 3). Inspect O-rings for wear; if necessary, replace them. Lubricate the O-rings with a water-soluble lubricant and replace them in the housing. Keep the reverse osmosis module in an upright position while reattaching the housing, to ensure that the O-ring stays securely seated and reduces the chances of leaking.
  
  
• 4). Replace the sediment filter, in the first housing on the left where the water inlet connects.
  
  
• 5). Replace the carbon block filter (has a mesh covering and gaskets on ends), located in the second housing.
  
  

Annual Maintenance

• 1). Drain all water from the reverse osmosis tank.
  
  
• 2). Replace the final filters from both ends of the tank. Remove the white nuts from both ends of the filter, remove the connectors from both ends, and replace the old final filter with new final filters on both ends. Be sure that the flow arrow on the final filter points in the direction of water flow towards the faucet.
  
  
• 3). Remove blue tube from the tank side of the shut-off switch. Depress the gray ring around the tube with your finger, and pull the tube straight out.
  
  
• 4). Insert 1/2 teaspoon of 3 percent hydrogen peroxide or household bleach into the blue tube, and reinsert the tube into the shut-off switch.
  
  

Membrane Replacement

• 1). Be vigilant to reductions in water production or changes in the taste of RO water. Should these changes take place, you must replace the membrane. To begin, use a socket wrench, 5/8 inch in diameter, to remove the nut from the cap side of the membrane housing.
  
  
• 2). Pull on the membrane filter with a pair of pliers. Discard.
  
  
• 3). Unwrap the new membrane filter. Lubricate its O-rings with water-soluble lubricant. Insert it into the membrane housing, below the housing edge. Replace the membrane filter housing cap.
  
  
• 4). Change the flow restrictor anytime you replace the membrane filter. Remove the white compression nuts, and make sure the arrow on the flow restrictor is pointing towards the check valves and hot water line housing.