Trickling Biofilters
Enhanced Treatment for Challenging Soil and Space Conditions
Trickling biofilters offer a powerful solution for treating wastewater when traditional soil absorption systems are limited. These systems provide secondary treatment by filtering effluent through a specialized medium that supports microbial growth. This added filtration step “polishes” the wastewater before it enters the soil, protecting groundwater and ensuring cleaner, more efficient treatment.
How It Works
After leaving the septic tank, wastewater is distributed over a filter medium, often made from synthetic or natural materials. As the effluent trickles downward, bacteria and protozoa living on the medium consume organic matter, removing harmful contaminants.
Once the microbial colonies are well established (known as biomass), the system consistently delivers high-quality treatment.
Trickling biofilters are ideal for:
- Sites with shallow or restrictive soils
- Limited space for soil dispersal
- Sensitive environmental areas requiring additional treatment
Why Regular Maintenance Is Essential
Failing to maintain your biofilter system can lead to serious health and environmental consequences, including contamination of nearby wells and waterways.
Health Risks
Untreated wastewater can carry diseases such as:
Hepatitis A
Salmonella
Giardiasis
Cholera
Tetanus
Typhoid fever
It can also introduce excess nitrogen and phosphorus into local water bodies, disrupting ecosystems.
Financial Risks
Regular pumping and maintenance cost $150–$300, but a failed system can require $10,000 to $30,000 to replace.
Inadequate maintenance may also lower property value or leave you with no viable alternative for onsite treatment.
Do’s of Biofilter System Care
- Obtain permits before making repairs or changes
- Hire certified installers and inspectors
- Keep your tank and access lids visible and secure
- Pump tanks every 2–5 years
- Record all maintenance and repairs
- Divert roof drains and runoff away from the system
- Use water-saving fixtures and habits
Don’ts of Biofilter System Use
- Don’t enter a septic tank, toxic gases can be fatal
- Don’t drive or park over the system area
- Don’t plant trees near components, roots may cause damage
- Don’t pour chemicals, fats, oils, or grease into drains
- Don’t use toilets as trash cans (wipes, diapers, etc.)
- Don’t rely on enzyme or yeast additives, they’re unproven and often harmful
Want to Learn More?
View our Media Filter System Homeowner Brochure (PDF) for a visual guide.
Questions? We’re here to help.
contact@mosmallflows.org
(417) 631-4027