Membrane Preservation Instructions
Directions for bench preservation of Thin Film Composite (TFC) membranes.

1. Clean the membrane prior to preserving it (see instruction for membrane cleaning).
2. After cleaning, drain the water from the pressure vessel.
3. Using a solution tank, dissolve one ounce (1 oz.) of membrane preservative for each gallon of cleaning solution required and stir thoroughly until fully dissolved.
4. Connect product (permeate) and brine (reject) lines from the pressure vessel to the solution tank. Connect the feed line from your recirculation pump to the inlet of the pressure vessel.
5. Feed the solution at low pressure and low flow rate. Do not exceed 50 PSI of feed pressure or a flowrate of 1.5-2.5 GPM for 2.5” OD membranes and 4-5 GPM for 4.0” OD membranes.
6. Recirculate the solution for 30 minutes.
7. Shut down the system and remove the tubing from the solution tank. Ensure that there is no chemical drainage to the rest of the RO system.
8. On restarting the R.O. system,
run the product water to waste for 30 minutes at low pressure and then run the product to waste for an additional 30 minutes

Membrane Cleaning Instructions
Directions for bench cleaning of Thin Film Composite (TFC) membranes.

1. Use a closed-loop system with a filter and pump, but do not exceed 50 PSI during recirculation. The cleaning solution temperature should not exceed 50°C (122°F) for a pH of 2-9; 35°C (95°F) for a pH 10-11; and 26°C (80°F) for a pH 11-12.
2. Drain the water from the RO pressure vessel.
3. Using a solution tank, dissolve one ounce (1 oz.) of Organic Cleaner (alkaline) or Mineral Cleaner (Acid) for each gallon of cleaning solution required and stir thoroughly until fully dissolved.
4. Connect product (permeate) and brine (reject) lines from the pressure vessel to the solution tank. Connect the feed line from your recirculation pump to the inlet of the pressure vessel.
5. Feed the solution at low pressure and low flow rate. Do not exceed 50 PSI of feed pressure or a flowrate of 1.5-2.5 GPM for 2.5” OD membranes and 4-5 GPM for 4.0” OD membranes. Use a pH of 11.5 for Organic cleaning (Alkaline) and a pH of 2.0 for Mineral Scale cleaning (Acid).
6. Recirculate the solution for 15 minutes and then allow to soak for one hour minimum. Severe fouling could require 10 or more hours of soaking.
7. Recirculate the solution for 30 minutes (Do not exceed 50 PSI.). Occasionally strike the pressure vessel with a rubber mallet in several places to dislodge scale and other contaminants.
8. Shut down the system and remove the tubing from the solution tank. Attach a clean, chlorine free water source and rinse the membrane for 15-30 minutes at 50 PSI. During this time allow the product and reject lines to run to drain.
9. Test the membranes performance.
10. If your test results are satisfactory, the cleaning is completed. Reconnect lines to drain & product tanks. If an unsatisfactory result is obtained, repeat the cleaning cycle.

IMPORTANT NOTES
• Use 1 oz. of chemical to make 1 gallon of solution, use 1 lb. of chemical to make 15 gallons of solution.
• A single 2.5” OD membrane requires approximately 2-3 gallons of solutions, a single 4.0” OD membrane requires approximately 4 gallons of solution.
• For durability, we suggest using
polyester spun or polyester string wound filter cartridge for the cleaning process.
• Be aware that if too many cleanings are required it may become more cost effective to simply replace the element.
• Do not reverse pressurize the product water line. This can result in permanent damage to the membrane element.
• It is advisable to use an organic cleaner before using a mineral scale cleaner. It may be necessary to alternate cleaning solutions and repeat the process in case of severe fouling.

WARNING
• Read all safety warnings on product packaging before use.
• Always wear protective eye-wear and gloves when handling any cleaning chemicals.
• Always perform cleaning procedures in a well ventilated area.

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