Sewage treatment system installed
barely visible above ground
Biorock sewage treatment plant
With pump
Biorock sewage treatment plant
Without pump, no electricity needed

BIOROCK, the best residential wastewater treatment system without electricity, zero energy. 25 years warranty!

Multiple advantages:

Revolutionary technology

  • No electricity required
  • No moving parts
  • 24 hour start-up
  • Long absence periods acceptable

Unique comfort

  • Completely silent
  • Lowest operational costs
  • Superb effluent quality
  • Septic tank conversion unit (retrofit)

Most sustainable

  • Long lifespan BIOROCK® Media
  • Low carbon footprint
  • Minimum annual maintenance
  • Long de-sludge interval

Superb Strength!!

All the BIOROCK® units and Primary Tanks are designed and manufactured to suit all ground conditions including high ground water.

BIOROCK® Non-Electric Septic Tank Conversion Unit: Our aerobic wastewater treatment system uses no electricity for the treatment process and can be added to an existing septic tank.


When buying a wastewater treatment plant in New Zealand: BIOROCK®! The low-maintenance, non-electric(*) onsite waste water treatment system.

Installation for all type of ground conditions and applications:

  • Reinforced and durable, the BIOROCK® units and Primary Tanks are reinforced as standard enabling them to be structurally sound in all ground conditions such as high ground-water sites.
  • The BIOROCK® has the ability to handle intermittent, seasonal wastewater loadings, even during long absence periods – Ideal for Holiday Homes, Campsites, Caravan Parks, etc.
  • The BIOROCK® can also handle low utilization levels without compromising the treated effluent quality.
  • BIOROCK® Non-Electric Septic Tank Conversion Unit: Our plant uses no electricity for the treatment process and can be added to an existing septic tank.

(*) BIOROCK® high-level discharge requires the use of a small pump to reuse the treated effluent if needed.

BIOROCK On-Site Sewerage Facilities

BIOROCK® offers a complete range of compact non-electric Residential Aerobic Treatment Units from 5 person systems. If installed in parallel the treatment units can also cater for larger capacities. BIOROCK® non-electric residential onsite wastewater treatment systems offer an ideal solution for domestic waste water treatment in New Zealand.

The BIOROCK® systems are very compact and free from any blower or air diffusors. They don’t need any electricity for the treatment process, leading to minimal maintenance and repair costs, the lowest operational costs and the longest desludge intervals.  These unique advantages lead to significant costs savings for the user compared to conventional wastewater treatment plants, as the reliability of the system is maximized with no possible breakdowns thus no need for expensive spare parts.

About the BIOROCK Media

BIOROCK® uses a material with huge surface area which allows colonization of the necessary bacteria, a process which is essential for the effective treatment of domestic wastewater.

The BIOROCK® media is highly resistant to degradation and remains extremely stable over the long term - our 25 years’ experience in the industry being proof of this.

  • Very stable inorganic material - does not break down over time, unlike “organic” media.
  • Requires little maintenance – scraping and scarification is not necessary, unlike for organic media.
  • The structure and composition ensures unsurpassed and unique surface treatment with exceptional purification results.
  • Ecological material, locally produced and recyclable.

BIOROCK® offers a much more efficient and ecological wastewater treatment technique compared to traditional techniques that are very high in maintenance and energy consumption.

The best final effluent testing results in New Zealand

BIOROCK® wastewater treatment systems clean the sewage to an astonishing level of purity. BIOROCK is one of Europe’s most popular home treatment plants and is fast becoming the system of choice in New Zealand. Our residential wastewater treatment systems can be used anywhere where no water treatment works is available.

BIOROCK® also stands out as one of the most successful systems at the independent test facility in Rotorua. It is a proven system that meets NZ performance requirements: BIOROCK is certified to meet the secondary effluent quality requirements of AS/NZS 1547:2012.