ST4500 Septic Tank

A septic tank is designed to provide what is known as primary treatment to crude wastewater produced in a normal domestic environment. It retains solids and allows them to settle out, where they can be partially broken down by biological action so that only the remaining liquor is left to flow down the outlet drain. This liquor (normally called effluent) is then sufficiently treated to soak into the ground in an underground soak away system.


  • CE Approved to BSEN 12566-1
  • Designed in accordance with British Standard Code BS6297
  • One piece moulded medium density polyethylene tank 
  • Lifting eyes 
  • Adjustable invert level from 770mm (standard) to 440mm (minimum)
  • 110mm inlet and outlet connections 
  • 600mm access lid 
  • 110mm connection for rodding access
Extra Features 

  • Extension neck available for deeper invert levels 

  • Tank is impact resistant 
  • Wide base for stabiliy 
  • Easier handling with lifting eyes 
  • Availble in 4 different systems, serving 1-22 inhabients

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Population Served: 11-14
Max Hydraulic Load (l/day): 2,520
Organic Load (g BOD/day): n/a
NH3 (g/per day): n/a
Total Capacity (litres): 4,546

Diameter (mm): 2,165
Height to ground level (mm): 2,920
Empty Plant Weight (kg): 230

Energy usuage (kWh/day): 0
Desludging Intervals (months): 12 

Inlet/Outlet Connections (mm): 110
Access Lid (mm): 600

Accreditation: CE (BSEN 12566-1)

ST 4500 (Septic Tank - Drawing)
Product Drawing / Schematic