The Dow Filmtec BW30-4040 brackish water reverse osmosis membrane elements provide consistent and outstanding system performance in light industrial applications. The Filmtec BW30-4040 features the thickest feed spacer (34 mil) to lessen the impact of fouling. Elements with a hard shell exterior are recommended for systems with multiple-element housings containing three or more membranes, as they are designed to withstand higher pressure drops. The Dow Filmtec BW30-4040 industrial RO membrane may be cleaned over the widest pH range (pH 1-13) for the most effective cleaning.