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Clearwater BioTec E25 Sewage Treatment System (up to 25 person)

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Direct Drainage Reviews

The Clearwater BioTec E25 Sewage Treatment Plants is ideal up to 25 people and employs a well-proven aerobic biological process for the treatment of sewage.

The Clearwater BioTec E Range is available as a gravity fed system or with an Integral Pump (IPS) and with either a 1000mm or 1500mm invert level. An isolator and failure light are included as standard. 

Sizing your System

BTA1 - suitable for up to 6 people

E9 - suitable for up to 9 people

E12 - suitable for up to 12 people

E18 - suitable for up to 18 people

E25 - suitable for up to 25 people


How the Clearwater E25 Sewage Treatment System works

Three distinct process stages take place within the single tank

  1. Coarse solids are filtered and retained 
for gradual breakdown
  2. The resulting liquid is continuously distributed over a plastic suspended filter by an integral lift, powered by a remotely-sited blower
  3. The solids are allowed to settle and, under normal domestic conditions, treated water of 20mg/l BOD, 30mg/l S.S., 20mg/l Ammonia can be achieved

Features of the Clearwater Sewage Treatment System

  • Superior performance rating
  • Subject to consent and site conditions, the plant can discharge directly to a watercourse
  • No mechanical or electrical components within the plant - low running and maintenance costs
  • Low-level visibility with a lockable child-proof pedestrian duty cover - safe for children and pets
  • Controlled ventilation - minimises risk of odour nuisance
  • Easy to install and maintain with annual de-sludging


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