Filters 

0:03 - Sandmedia filters
3:40 - Throttling Valve
4:43 - Command Filter
5:28 - Valve Operation
6:10 - Quick Pressure Relief Valve
6:50 - Disc Filter
9:06 - Backflush Controller
Additional Resources:
Sandmedia Filters - www.netafimusa...
DISC Filters - www.netafimusa...