Expert and Friendly Advice
Free Delivery Available
Installation Service Available
  • Clearwater Sigma Septic Tank  (3800L) 12 Person

This intelligently designed Shallow Dig Septic Tank has been designed to save you time and money during installation.   This unit will typically save you 50% of your installation costs as money is saved on:-

  • Excavation costs
  • Soil removal costs
  • Back fill costs


  • Pea gravel backfill for dry sites
  • EN 12566-1 approved
  • Installation in hard rock areas where deep digs are not possible
  • 30mm between inlet and outlet
  • 0.5 and 1m neck extensions available for deeper installations

Capacity - Litres 3,800
Diameter mm 1225
Height mm 1700
Length mm 3895
Persons 12
Standard Invert mm 500

Clearwater Sigma Septic Tank (3800L) 12 Person

  • Product Code: CWSD3800
  • Availability: In Stock
  • Clearwater Sigma Septic Tank: Download Here
  • £1,251.60 INC VAT

  • £1,043.00 EX VAT