Clean Filtration Technologies, maker of a self-cleaning, maintenance-free metal membrane used to process waste water and produce clean, healthy drinking water in high volumes, has brought in $3.55 million of a targeted $7.2 million round of equity and securities, according to a filing with the SEC. Based in Saratoga, Calif., the company has not disclosed any investors.

Its membrane, branded as the CFT Turboclone, is supposedly cheaper to make and install, lowering the overall cost of filtration systems that have been proven to last longer without regular maintenance than older filtration systems, the company says. Here’s a site detailing the features that distinguish it further.