FloSize 180

Summary

Product identification

• Product Name: FloSize 189
• Product Type: Cellulose acetate membrane sizing agent

Description and Use

FloSize 189 is a polymer-based additive designed to improve salt rejection in partially hydrolyzed cellulose acetate (CA) membranes. It is effective on all cellulose acetate blends but should never be used on thin-film composite membranes. For optimal effectiveness, the normalized salt rejection of the CA system should not be below 90%.

Operating Limits

• FloSize 189 is effective when used to restore salt rejection in CA systems to the manufacturer's specification range.
• The treatment procedure can be accomplished in less than 30 minutes without requiring system downtime.

Important Notes

• Sizing does not replicate the original membrane surface chemistry or its longevity.
• Sized membranes are more susceptible to feed water pH fluctuations and cleaning. Cleaning may necessitate re-sizing.
• At low storage temperatures, the packaged product may become cloudy and separate. Warming and stirring will restore a clear, homogeneous solution.

Dosing and Use Instructions

• Pre-treatment: Clean the RO system with a low pH cleaner (Kleen MCT103) followed by a neutral pH cleaner (Kleen MCT107). Contact a SUEZ representative for specific cleaning protocols.
• System Restart: Restart the RO system under normal operating parameters.
• Performance Check: Evaluate flow and rejection for each pressure vessel. Analyze vessels with abnormal readings.
• Maintenance: Replace defective O-rings and leaking modules.
• Chemical Injection: Acid injection equipment can be used, but must be thoroughly rinsed of acid before use, as the polymer can precipitate at low pH.
• Solution pH: The FloSize 189 solution should be maintained at pH 8. Adjust with ammonium hydroxide if necessary.
• Antiscalant Discontinuation: Stop feeding antiscalant.
• Drainage: Direct permeate and concentrate to drain.
• Pre-injection Flush: Operate the RO system at pH 7.0 for at least 5 minutes before injecting FloSize 189 to ensure proper membrane adherence.
• Injection Rate: Begin injecting FloSize 189 at a rate of 300 ppm. Note that the concentrate stream will contain high levels of unused polymer.
• Injection Duration: Continue injection until desired rejection levels are achieved or rejection stabilizes.
• Post-injection Flush: Discontinue FloSize 189 injection and operate the system for 15 minutes at pH 7 to flush residual polymer.
• Antiscalant Restart: Restart antiscalant injection.
• Pump Flush: Thoroughly flush the chemical injection pump by recirculating pH 8 water.
• Acid Injection Restart: Restart acid injection and adjust system feed pH to the standard operating range of 5.5 to 6.0.
• System Reconnection: Reconnect permeate and concentrate to standard operating configurations.
• Monitoring: Closely monitor system performance for 48 hours; normalized rejection should be stable.

Packaging Information

FloSize 189 is a liquid material available in various customized containers and delivery methods. Contact a SUEZ sales representative for details.

Safety Precautions

A Material Safety Data Sheet (MSDS) with detailed product information is available upon request or online at www.suezwatertechnologies.com.

Disclaimer: This 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