1. January 201101  Principle: Elements with the lowest production and highest rejection in the first positions and elements with the highest production in the rear positions of the vessel  Advantages vs. conventional configuration Better hydraulics resulting in lower flux in the front modules: o Lower fouling potential -> lower energy required o Less cleaning needed -> longer membrane life Lower energy requirement for a given production and/or higher production for a given pressure due to the use of high flow elements in the rear positions Configuration – Internally Staged Design Internally Staged Design (ISD) Conventional

2. January 201102 6 x SW30HRLE-400i (7,500 gpd) Recovery system 37.11% 6 x SW30ULE-400i (11,000 gpd) Recovery system 42.42% 1 x SW30HRLE-400i + 1 x SW30XLE-400i + 4 x SW30ULE-400i Recovery system 41.80% * Feed pressure: 56 bar * Feed TDS: 35,000 ppm * Feed flow: 12,4 m 3 /h 1 x 7,500 gpd + 1 x 9,000 gpd + 4 x 11,000 gpd Conventional ISD Configuration – Internally Staged Design

3. January 201103 Average Flux of the vessel (L/m 2 h) 1415.76 Maximum permeate flow per element 0.99 COST (UScts/m 3 ) Highest FF & T 60.1458.27 COST (UScts/m 3 ) Lowest FF & T 63.6560.05 % savings on cost of water* Highest FF & T Lowest FF & T 3.1% 5.7% SW30HRLE-400iSW30XHR-400iSW30ULE-400i * COST CALCULATION (TOOLS): CAPEX and OPEX are taken into account. Model is prepared by a Consulting Company* for Dow (John Tonner Water Consultants International Inc.) Configuration – Internally Staged Design

4. January 201104 Configuration – Internally Staged Design

5. January 201105 Configuration – Internally Staged Design