TriSep offers five versions of it's popular ACM series reverse osmosis membrane elements. The ACM line is the workhorse of theTriSep RO line. It delivers high flux and high rejection in a durable and economical membrane. The membrane has a good combination of chemical resistance and mechanical strength. This is exhibited by wide operating pH ranges (2-12), some resistance to oxidants such as chlorine (up to 2,000 ppm-hrs) and hydrogen peroxide, and pressures up to 1,000 psi (70 bar) with the proper construction.

ACM RO membranes typically have higher salt (NaCl) rejection than cellulose acetate or nanofiltration membranes, but in the ACM4 and ACM5 configurations have high specific flux rates and can, therefore, operate at lower feed pressures. ACM RO membranes have the ability to reject a wide range of feed species, specifically: particulates, colloidal and microbiological species, hardness, sulfate and other multivalent ions, and soluble low molecular weight (> 200 Daltons) neutral and charged organic compounds.

The ACM product line is available in 5 versions. The ACM1 and ACM2 offer the highest rejection (99.5%) and typically operate at 150 - 200 psi (10 - 14 bar). The ACM2 is one of our most popular membrane elements. It is a defacto standard for typical water purification requirements. The ACM1 and ACM2 are preferred in applications with high feedwater TDS (>3,000 ppm) and/or high recovery. The lower specific flux of these membranes compared to the ACM4 and ACM5 allows for a more balanced hydraulic flow through the system and more balanced permeate flux rates due to the high osmotic pressure of these feedwaters.

For applications where a lower operating pressure is required but you still need very high salt rejections, the ACM3 may fit the bill. This membrane typically operates at 125 - 175 psi (9 - 12 bar) but still maintains a very high salt rejection (99.5%).

For ultra low pressure operation, the ACM-LP line of ACM4 and the new ACM5 may be the best choise. These membranes have extremely high specific flux, comparable to NF membranes, while still offering excellent salt rejection (98.5-99.2%). These membranes typically operate at feed pressures of 75-150 psi (5 - 10 bar). Due to the high specific flux, these membranes are best suited to applicaitons with relatively low TDS (<3,000 ppm) to achieve balanced flux rates within the system.