Flathead Forge Fund 1 has invested in NALA Membranes, a North Carolina developer of chlorine-stable membranes for industrial water purification and reuse.

NALA's sulfonated polysulfone membranes solve a constraint that has defined reverse osmosis for four decades. Conventional polyamide membranes degrade on contact with chlorine, the cheapest and most effective tool for controlling the biofouling that drives up operating costs