Hydranautics' ESPA4 low energy membrane delivers even greater productivity and rejection, now at operating pressures of less than 100 psi. ESPA4 membranes have long been the industry leaders, with the highest productivity and rejection available, producing up to 14,000 GPD. Enjoy up to 250% greater productivity per membrane area compared with conventional polyamide membranes, at the lowest cost per gallon produced. ESPA4-LD membranes feature Hydranautics LD Technology - high-performance RO technology that helps reduce fouling from colloidal particles and biological growth. LD Technology uses proprietary feed spacers to reduce bio-growth (NSF 61 approved For drinking water). This innovative feed spacer design prevents the trapping of small colloidal particles and improves the effectiveness of cleanings.

ESPA4-LD

• Up to 99. 6% Nominal Rejection
• Lower pressure for lower CAPEX/OPEX
• High Productivity Longer Membrane Life due to Low Biological and Colloidal Fouling
• Higher rejection for impurities including Silica and Boron
• Greater Tolerance to High pH Cleaning
• Replaces ESPA4

• Maximum Operating Temperature: 113F (45C)
• Chlorine Tolerance: 0.1 PPM
• pH Range, Continuous Operation: 2-10
• pH Range, Short Term Cleaning (30min): 1-12
• Maximum Feed Water Turbidity (NTU): 1
• Maximum Feed Water Silt Density Index (SDI): 5
• Maximum Pressure Drop For Each Element: 10 psi
• Maximum Feed Flow: 75 GPM