ROCLEAN

RoClean P112

High pH RO Membrane Cleaner - Powder

RoClean P112 is a powdered cleaner designed to remove silt and organic foulants such as colloidal silica, clays, organic color and bacterial slime from spiral wound thinfilm elements.

Extensive field experience and laboratory analyses have shown RoClean P112 is an effective silica scale cleaner. Use of RoClean P112 also avoids the potentially severe safety hazards associated with alternative chemicals commonly used in silica scale removal. These include hydrofluoric acid and ammonium bifluoride solutions.

Performance:

RoClean P112 offers a variety of performance benefits:

• Superior results in the removal of organic and colloidal foulants, especially when compared to generic solutions.
• Compatible with the thinfilm (polyamide) elements of all major membrane manufacturers.
• NSF Certified for off-line use in systems producing drinking water.
• Contains a specialized blend of buffers and other components to dissolve organic foulants and disperse colloidal particles.
• Highly buffered to resist pH changes during the cleaning process.
• Can be used in conjunction with other applicable cleaners as shown in the Avista cleaner selection guide.
• Temperature compensated to maintain optimum pH over a wide temperature range.

Use Instructions:

Below is a summary of the RoClean P112 cleaning guidelines. For detailed procedures, please consult the Avista technical bulletin entitled "Cleaning of Spiral Wound Membrane Systems".

1. Fill the cleaning tank to the desired volume with RO permeate or DI water. Heat the solution to 35°C as this will dramatically increase the cleaning efficiency. Add sufficient RoClean P112 to create a 2% wt/wt solution if the fouling is moderate/severe or 1% if the fouling is mild. Recycle the solution through the cleaning tank to ensure adequate mixing.
2. Recirculate the cleaning solution through each RO system stage, one at a time, for a minimum of 60 minutes at the flow rate recommended by the membrane manufacturer. If that rate is not known, use the guidelines listed below:

   Element Diameter	Flowrate per Vessel, gpm (m3/hr)
   4"	10 (2.4)
   8"	40 (9)

3. If the membranes are heavily fouled and the recirculated cleaning solution becomes discolored or turbid, discard as much as 15% of the solution volume. Heavily fouled elements may also benefit from a soak period (up to 8 hours).
4. Monitor the pH of the solution during the cleaning process. If the pH remains in the desired range and the solution is not turbid, it may be used to clean subsequent stages. In the unlikely event that the pH falls below 11.7, prepare a new batch and repeat steps 1-4.
5. When the clean is completed, rinse the membranes by recirculating RO permeate through each pressure vessel. The system can then be returned to service.

Packaging and Storage:

Standard regional pack sizes are listed below. Custom packing available on request.

Specifications Appearance: Cream powder pH (2% solution): 12 — 12.8 Density (kg/litre): 1.2 ± 0.05

Packaging Formats Americas EMEA Pails 45 lbs 20 kg Fibre Carboy 100 lbs n/a Fibre Drums 350 lbs n/a

DRINKING WATER TREATMENT ADDITIVES CLASSIFIED BY NATIONAL SANTATION FOUNDATION TO ANSI/NSF 60 ON OCTOBER 2007 AS STANDARD DRINKING WATER TREATMENT CHEMICAL FOR USE OFF-LINE IN REVERSE OSMOSIS SYSTEMS.

10/08