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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.


Parameter Units SFSF-1000 SFSF-2000 SFSF-4000 SFSF-6000
Performance Hydraulic capacity (max) m3/hr 54 144 288 576
Typical flow for municipal wastewater m3/hr 31 79 158 394
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 sizes micron 54 / 90 / 110 / 154 / 180 / 210 / 250 / 300 / 350 / 540 / 840
Weight & Dimensions Weight (dry) kg 415 690 1,020 1,120
Length x width x height m 1.4 x 1.3 x 1.4 2.1 x 1.6 x 1.3 2.5 x 2.0 x 1.5 2.8 x 2.5 x 1.8
Inlet diameter (pumped/*1gravity fed) mm DN 100 / 100 DN 150 / 200 DN 200 / 350 DN 250 / 400
Outlet diameter mm DN150 DN 250 DN 350 DN 400
Overflow diameter mm *2N/A DN 250 DN 350 DN 400
Bottom drain diameter mm N/A DN 100
Water connection mm 13 BSP 19 BSP
Power Supply - AC 415V, 3 Phase, 50 Hz
Consumption Filter kW 3.1 4.3 5.1 6.1
*1Control panel air conditioner kW 1.8 1.8 1.8 1.8
Materials Filter & screw press enclosures - SS316L
Filter Mesh - Polyethylene
Screw press screw - Carbon steel
Control panel - SS304 (optional SS316L)
Temperature Ambient (min/max) °C 0 ~ 40 (-5 ~ 50 with optional control panel air conditioner)
Influent (max) °C 80
Control panel IP rating IP 65 (67 with optional control panel air-conditioner)

*1 Optional Equipment *2 Combined with outlet



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

Equipment   SFSF-1000 SFSF-2000 SFSF-4000 SFSF-6000
Enclosed, free standing filter with lockable lids and odour control port
Influent connection Flanged inlet connection for pumped feed
Open inlet chamber for gravity feed o o o o
Inclined (35°) rotating belt filter
Air knife blower Integral to filter housing - - -
External to filter housing -
Sludge handling system Sludge trough with screw press
Sludge trough with sludge pump o o o o
Control panel PLC (Allen Bradley)
Colour touch screen (Beijer) HMI
Wall mounting lugs
SS304 enclosure
SS316L enclosure o o o o
Mounting pedestal o o o o
Enclosure air conditioning o o o o
Safety equipment Filter & panel mounted E-stops
Open lid detection for auto shutdown o o o o
Water flushing connection(s) Cold water (basin flushing) -
Hot water (mesh cleaning)
Feed pump o o o o
Pre-treatment Flocculation tubes and/or flocculant dosing o o o o
pH adjustment (caustic and/or acid dosing) o o o o
Hot water flushing heater o o o o
ClearAccessTM remote monitoring o o o o


Instrumentation SFSF-1000 SFSF-2000 SFSF-4000 SFSF-6000
Water level sensor
Air knife pressure sensor
VSD Mesh motor
Screw press auger motor
Lid open sensors o
ClearAccessTM remote monitoring o

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.

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