3M™ Liqui-Flux™ Membrane Modules for water ultrafiltration have at least three connecting ports for feed, concentrate and filtrate. Some types offer a second filtrate connection in the lower section that can be used alternatively or in parallel for additional purposes such as draining or sampling.
In order to remove built up particles from the membrane surface, the module needs to be backflushed regularly. Because some residues slowly accumulate during continuous operation, the module should be run through chemically enhanced backwash cycles. This is where cleaning chemicals are added to the back flush water so that the module requires fewer backflush cycles.
A variety of backflush operating procedures are explained schematically with only one module. Large-scale installations with a number of modules in parallel are operated the same way.