Kleen ENV903

Summary

Product identification

Kleen* ENV903 membrane cleaner

Description

Kleen ENV903 is a low pH liquid formulation designed to remove metal hydroxides, calcium carbonate, and similar scales from RO, NF, UF, and MF membranes. It contains environmentally friendly solubilizing and complexing agents.

• Environmentally friendly formulation: contains no EDTA, NPE/APE, or phosphates.
• Suitable for use with all types of membranes.
• Liquid product, buffered to maintain an effective pH over a range of dilutions.
• Enhanced performance at elevated temperatures.
• No adverse effects with repeated use.
• Optimum results are obtained when used in conjunction with Kleen ENV911.

Typical Application

This product is used for clean-in-place (CIP) or off-line cleaning of membrane separation systems to remove scale that impedes water flow and can reduce product water quality or damage membranes. Indications for cleaning include:

• Significant decrease in normalized permeate flow.
• Significant increase in system pressure drop.
• Increase in normalized salt passage.

Feed Requirements

Dilution

The product must be diluted prior to use.

• Recommended dilution: one pound (0.45 kg) of Kleen ENV903 per 5 gallons (19 L) of water.
• Alternatively: approximately one gallon (3.8 L) of Kleen ENV903 for each 50 gallons (189 L) of water.
• Target conductivity range for this dilution: 3,800 to 4,100 micromhos.

General Cleaning Instructions

1. Inspect and clean the cleaning tank, hoses, and replace cartridge filters.
2. Fill the cleaning tank with RO permeate or DI water. Turn on the agitator or recirculation pump.
3. Slowly add the recommended amount of Kleen ENV903 and mix thoroughly.
4. Check solution temperature. Do not allow the temperature to exceed 95°F (34°C).
5. Check solution pH. The target range is 2.5 to 3.5, or as recommended by the membrane manufacturer. Adjust pH as needed using NaOH or hydrochloric acid.
6. Circulate the solution in the direction of feed flow for 30 minutes at the manufacturer's recommended flow rate. For heavy fouling, the first return flow (up to 15% of cleaning tank volume) should be diverted to drain.
7. Minimize foaming by placing return lines below the liquid level in the CIP tank. Do not use antifoam, as most are not compatible with PA membranes.
8. If the cleaning solution becomes turbid or discolored, or if pH or temperature moves out of the recommended range, prepare a fresh solution.
9. Rinse the system with RO permeate water.
10. When returning the unit to service, divert product water to drain until residual cleaning solution is rinsed from the system.

A soak period may be necessary depending on the fouling. Consult your SUEZ representative for details.

Disclaimer: Extraction may miss figures, footnotes, or revisions; contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror