ROCLEAN

RoClean P703

Low pH RO Membrane Cleaner - Powder

RoClean P703 is a low pH powdered cleaner designed to remove iron, manganese, and aluminum deposits from spiral wound thinfilm and cellulose acetate elements.

This formulation is temperature compensated to ensure that the cleaning solution remains in the effective pH range regardless of variations in solution temperature.

Performance:

RoClean P703 offers an array of performance benefits:

• Superior results in the removal of metals and calcium carbonate scale, especially when compared to generic citric and hydrochloric acid solutions.
• Compatible with the thinfilm (polyamide) and cellulose acetate elements.
• Contains a proprietary blend of buffers, chelants, and reducing agents to promote the dissolution of metal deposits.
• 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 P703 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 the maximum acceptable temperature (see membrane manufacturer guidelines, or use 50°C) as this will dramatically increase the cleaning efficiency. Add sufficient RoClean P703 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 of 3.5 and the solution is not turbid, it may be used to clean subsequent stages. In the unlikely event that the pH rises above 3.5, 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 packaging can be provided worldwide to meet customer needs. Information on drumless or bulk tanker delivery is available on request.

Specifications Appearance: Cream powder pH (2% solution): 2.5 — 3.5 Density (kg/litre): 0.95 ± 0.05

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

10/08