Pentair FLECK 3900 NXT - Filter Cycle (3-Cycles Operation)

Installer Manual Fleck 3900 - NXT - Description
22 / 126 Ref. MKT-IM-015 / B - 08.06.2018
3.4.3. Filter cycle (3-cycles operation)
Service — normal use
Unfiltered water is directed down through the media and up through the riser tube. The water is
filtered as it passes through the media.
Backwash — cycle C1 for DF configuration, C2 for UF configuration
The flow of water is reversed by the valve and directed down through the riser tube and up through
the media. During the backwash cycle, the media is expanded and debris is flushed to the drain.
Rapid rinse — cycle C3 for DF configuration, C4 for UF configuration
The valve directs water down through the media and up through the riser tube to the drain while the
media is re-compacted.