Household membrane reduces most TDS (total dissolved solids) by 95%. Fits in standard membrane housings.CSM claims that their membranes perform as well as any available in the industry. A: 0.67" B: 0.87" C: 11.73" D: 1.77" E: 0.87" Model Name Performance Dimension Testing Pressure Test Condition Permeates Flow Rate GPD (m3/day) Salt Rejec- tion % Diam Inch (mm) Length Inch (mm) RE1812-24 24 (94) 96.0 1.8 (46) 12 (305) 60 PSI Household Standard RE1812-35 35 (132) 96.0 1.8 (46) 12 (305) 60 PSI Household Standard RE1812-50 45 (170) 96.0 1.8 (45) 12 (305) 60 PSI Household Standard RE1812-60 60 (227) 96.0 1.8 (46) 12 (305) 60 PSI Household Standard RE1812-80 80 (303) 96.0 1.8 (46) 12 (305) 60 PSI Household Standard RE1812-100 100 (397) 96.0 2 (50) 12 (304.8) 60 PSI Household Standard RE1812-LP 50 (189) 93.0 2.0 (50) 12 (305) 20 PSI Household LP