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February 6, 2014 at 1:42 pm #11649
This is, or was, the name for RPA (formerly Ronningen-Petter) filter systems. These are banks of tubes mounted on manifolds that usually have a 3 or 4 valves to switch from filtering to backwashing. Similar to Nowata ProGuard and Durco built some of these in the past as well.
And yes, these were primarily installed with wedgewire filter media.