What is a Septic System?

Septic systems are a wastewater treatment system that is installed underground. Septic systems are normally used in more rural areas that are without a local sewer treatment systems. A traditional septic system consists of a septic tank and a filter bed, or tile bed. Once the household wastewater enters the tank, the bacteria then breaks down the organic matter and separates the floatable materials and solids from the wastewater. The outlet of the tank then releases the liquid ( also known as effluent) from the septic's tank into a filter or tile bed.


How a typical septic system works.

Black and grey water go out from your house or cottage into the main pipe, then into a concrete or plastic septic tank. The plastic or concrete septic tank is located underground, the septic tank's job is to hold the black and grey water that comes from your home long enough to allow solid waste to settle down into the bottom of the tank, while the oil and grease from the water float above into a layer of scum. An outlet in the shape of a T prevents the solids from the bottom of the tank and the oil and grease from the top leaving the tank and traveling to the bed area.  The effluent then leaves the tank through the outlet into the bed. Which over time breaks down into groundwater.

Ways to keep your septic healthy:



  • Use water efficiently

  • Don't flush hazardous chemicals or medications. 

  • Plant only grass over and near your septic system. Tree roots can damage pipes in your system.

  • Do not drive or park any vehicles on any part of your septic system to avoid crushing the system

  • Test your well water. 

Septic filter bed

What is the Waterloo Biofilter?

The Waterloo Biofilter is an absorbent trickling biological filter used to treat sewage and other wastewaters from a variety of sources. The filter medium used in the Waterloo Biofilter has been specially engineered to optimize its physical characteristics so that high concentrations of beneficial microbes can inhabit it without plugging up. These naturally occurring bacteria thrive in the conditions created within the filter media where they degrade, oxidize and consume contaminants found in wastewater.


Waterloo Biofilter System

Residental Waterloo Biofilter Brochure

While the primary business model is septic installations, we have felt an onus to provide the services to ensure your septic system is built to last. With the recent wave of septic inspections, Thomas Contracting has expanded our operations to include an additional pump truck and a dedicated service crew for minor repairs.

For education purposes, Thomas Contracting has prepared displays of a typical septic tank (cutaway) and a simple pump and alarm setup. In the past, we have provided these displays to different lake associations and events in the area to demonstrate how a system should look. We would be glad to attend any association meetings you may have to address the concerns of your members.


In addition, we have partnered with a number of industry leaders to ensure we are using only quality products and offering quality services.

  • Infiltrator Water Technologies – our current septic tank supplier. While these tanks are plastic, 95% is made from recycled materials! In addition to the tanks, Infiltrator employs a number of engineers to pursue wastewater treatment solutions from a single household to municipal systems.

  • EcoEthic Inc. – whom many of you know for their environmentally friendly cleaners and septic care bacteria (both stocked at our office), but did you know they offer commercial products as well? These products can potentially rejuvenate a failing system, or provide a form of aftermarket treatment in some situations.

  • Pentair – one of the world-leading pump manufacturers. Traditionally carrying a more comprehensive warranty than the store brand alternatives, and having been proven in field for more than decade, these pumps are engineered to stand up to the task.

Francis Thomas Contracting Co Ltd

15561 HWY 35

Algonquin Highlands, ON

K0M 1J2


Tel: 705-489-2711
Fax: 705-489-1887

Toll Free: 1-855-489-2711






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