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Salsnes Fine Screen Filter

The Salsnes Fine Screen Filter (SFSF) provides compact, flexible and cost-effective solids separation for primary wastewater, storm water and industrial applications.

Three critical processes – solids separation, primary sludge thickening and sludge dewatering – are performed in one compact unit that can completely replace conventional primary treatment and does so in a fraction of the footprint – saving costs and valuable land space. It does this by building a filter mat; particles larger than the mesh opening start the process by partially blocking the mesh. This in turn traps smaller and smaller particles building the mat. Solids are gently lifted from the effluent for thickening and then dewatering via the onboard screw press.

The air knife filter mesh cleaning system uses compressed air to clean, which has many benefits compared to scrapers, brushes or waterbased cleaning systems. Air is gentler on the mesh (to extend its life) and on particles (so they don’t break into smaller pieces). Air cleaning also produces drier sludge for more effective dewatering.

The intelligent onboard controls make this a completely automated system, ideal for remote or unstaffed facilities. A water pressure sensor tells the unit when to rotate the filter mesh (and at what speed), while the PLC simultaneously starts the air knife and sludge screw press.


PerformanceHydraulic capacity (max)m3/hr54144288576
Typical flow for municipal wastewaterm3/hr3179158394
Suspended solids (TSS) removal%30 - 80% (design dependent)
Biological oxygen demand (BOD) removal%15 - 40% (design dependent)
Sludge dry matter after thickening%3 ~ 8%
Sludge dry matter after integrated dewatering unit%20 ~ 30%
Available mesh sizesmicron54 / 90 / 110 / 154 / 180 / 210 / 250 / 300 / 350 / 540 / 840
Weight & DimensionsWeight (dry)kg4156901,0201,120
Length x width x heightm1.4 x 1.3 x 1.42.1 x 1.6 x 1.32.5 x 2.0 x 1.52.8 x 2.5 x 1.8
Inlet diameter (pumped/*1gravity fed)mmDN 100 / 100DN 150 / 200DN 200 / 350DN 250 / 400
Outlet diametermmDN150DN 250DN 350DN 400
Overflow diametermm*2N/ADN 250DN 350DN 400
Bottom drain diametermmN/ADN 100
Water connectionmm13 BSP19 BSP
PowerSupply-AC 415V, 3 Phase, 50 Hz
*1Control panel air conditionerkW1.
MaterialsFilter & screw press enclosures-SS316L
Filter Mesh-Polyethylene
Screw press screw-Carbon steel
Control panel-SS304 (optional SS316L)
TemperatureAmbient (min/max)°C0 ~ 40 (-5 ~ 50 with optional control panel air conditioner)
Influent (max)°C80
Control panel IP ratingIP65 (67 with optional control panel air-conditioner)

*1 Optional Equipment *2 Combined with outlet



✓= Standard Supply o = Optional Supply - = Not Applicable

Equipment SFSF-1000SFSF-2000SFSF-4000SFSF-6000
Enclosed, free standing filter with lockable lids and odour control port
Influent connectionFlanged inlet connection for pumped feed
Open inlet chamber for gravity feedoooo
Inclined (35°) rotating belt filter
Air knife blowerIntegral to filter housing---
External to filter housing-
Sludge handling systemSludge trough with screw press
Sludge trough with sludge pumpoooo
Control panelPLC (Allen Bradley)
Colour touch screen (Beijer) HMI
Wall mounting lugs
SS304 enclosure
SS316L enclosureoooo
Mounting pedestaloooo
Enclosure air conditioningoooo
Safety equipmentFilter & panel mounted E-stops
Open lid detection for auto shutdownoooo
Water flushing connection(s)Cold water (basin flushing)-
Hot water (mesh cleaning)
Feed pumpoooo
Pre-treatmentFlocculation tubes and/or flocculant dosingoooo
pH adjustment (caustic and/or acid dosing)oooo
Hot water flushing heateroooo
ClearAccessTM remote monitoringoooo


Water level sensor
Air knife pressure sensor
VSDMesh motor
Screw press auger motor
Lid open sensorso
ClearAccessTM remote monitoringo

Disclaimer: MAK Water is continuously updating and improving its products and services, so please contact us for more detailed information or to confirm specifications. MAK Water takes no responsibility for any errors resulting from the use of information contained within this document.