HIDTM RO membrane 4040 ranks the best brands in China among RO membrane industry. It has won the trust of thousands of families for feeding the reliable purified water over 10 years. Each membrane is made of HID developed & pre-examined sheet and goes through stringent making processes as well as in-house quality inspection & testing before delivery. HID Membrane has been certified by SGS & China Jiangsu Sanitation Bureau wrt drinking water membrane elements. Model No. Feed Spacer thickness (mil) Min. Salt Rejection (%) Stabilized Salt Rejection (%) Permeate Flow Rate (gpd) Test Pressure (psi) Test water TDS (ppm) LP26-4040 28 99 99.2 2200 225 1500 ULP26-4040 28 98.3 99 2200 150 1500 XLP24-4040 28 97.5 98 2300 100 750 1. Permeate flow rate and salt rejection is based on testing conditions: 25℃, PH 7.5, 20% recovery. 2. Stabilized salt rejection is generally achieved within 24-48 hours of continuous use, depending upon feedwater characteristics and operating conditions. Model No. Maximum  Operating  Temperature Maximum  Operating  Pressure Feed Water  PH Range,  continuous  operation Maximum Feed Water Turbidity Maximum  Feed Water  SDI Chlorine  Tolerance LP26-4040 45℃ 600psi 2-11 1NTU 5 <0.1ppm ULP26-4040 45℃ 600psi 2-11 1NTU 5 <0.1ppm XLP24-4040 45℃ 600psi 2-11 1NTU 5 <0.1ppm