The Brightwater™ HSAF® unique SAF design provides a versatile static bed process, using the BMax® floating media, which can be configured for biological wastewater treatment in aerated mode or as a suspended solids filter in unaerated mode. 
Effluent performance can be engineered to suit particular applications. In tertiary mode for example, a Brightwater™ HSAF® would readily achieve discharge consents of <1 mg/l NH3N & <5 mg/l BOD. Phosphorous and total nitrogen removal can also be incorporated into the basic design.
BMax® media is a buoyant plastic media made from 100% recycled materials which can also be recycled at the end of the plant’s design life. Biomass grows on, within and between the media, providing treatment. Suspended solids will also become entrapped by the biomass, and the media voidage. Treated effluent is collected through a simple launder system at the top of the reactor.
Over time biomass and feed solids accumulate in the reactor and need to be removed. An automated clean cycle is used. The clean cycle consists of an air scour and one or more desludge stages. The air scour works by passing additional air through the air scour grid located at the base of each reactor. The scour air creates turbulence and fluidises the media releasing the excess solids and biomass. The reactor then undergoes a settlement period enabling the media bed to repack and the solids to collect at the base of the reactor. The solids are then removed from the base of the reactor prior to the reactor being put back online. During normal operation the HSAF® plant is a completely automated process and requires little maintenance or operator intervention.