Automatic Self-Cleaning Screen Filters

What the EX suffix means

An EX model carries the larger filter body of the next size up on the same connection size. FW150EX is a DN150 filter with 8,115 cm² of screen area against the standard FW150's 5,603 cm² — same pipe size, more screen. The extra area holds more solids between cleaning cycles, which suits water with a heavy or variable sediment load where a standard body would backwash more often than the site wants. Choose EX when the water is dirty for its pipe size; choose the standard body when it is not.

What the HP suffix means

On the FW Series the suffix is about the lid, not the screen. A standard FW body carries a GRP lid and is rated 2 to 10 bar; an FW HP body carries a stainless steel lid and is rated 2 to 16 bar, which is what gets specified when the duty sits above 10 bar. The FED Series is stainless steel throughout, lid included, so it starts at that level already — 0.5 to 16 bar as standard. Ratings to PN25 can be quoted on either series on request; they are not a stock item.

For the same decisions made on working sites — flow, water quality and what the cleaning cycle had to cope with — see the Filtaworx case studies.