In addition to their standard filters which operate at 40-150psi, TEKLEEN® has a line of fully automatic, self-cleaning water filters with working pressure as low as 15psi - the Low Pressure Filter (LPF) Series.
Watch the video below to see the filter in action.
[embed]https://www.youtube.com/watch?v=yE0c3OEE1VE[/embed]
The LPF Series filters are available in a wide range of industrial configurations and are designed and manufactured in accordance to ANSI and ASME standards (ASME U stamp is an option). Sizes range from 2" - 36", flow rates from 100 - 20,000 gpm, screen mesh from 25µ - 3,000µ.