Access to sanitation is essential for public health, clean water, and quality of life. While many communities now have access to toilets and pit latrines, managing waste over the long term remains a challenge.
As pit latrines and septic systems fill with sludge, households often face unpleasant odors, increased maintenance needs, and costly emptying services. In some cases, sanitation systems become difficult to use, reducing the long-term impact of sanitation investments.
To address this challenge, SCD Probiotics partnered with Outreach International and the San Isidro Kaakibat sa Pag-unlad Association (SIKAP Association) to evaluate the use of probiotics in community pit latrine systems in the Philippines.
The Challenge of Pit Latrine Maintenance
Many sanitation programs focus on increasing access to toilets. However, the work does not end once a latrine is built.
Over time, sludge accumulates inside containment systems. Odors increase, maintenance becomes more difficult, and households may struggle to find affordable options for desludging.
Community members in Barangay San Isidro, Lupao, Nueva Ecija identified pit latrine maintenance as an ongoing concern. Through Outreach International's community-led development process, local residents worked together to explore solutions that could improve sanitation conditions without requiring major infrastructure investments.
Using Probiotics for Sanitation Management
The project evaluated the use of SCD ScentGuard®, a probiotic solution containing beneficial microorganisms that consume organic waste and support natural biological processes.
Unlike chemical treatments that may temporarily suppress odors, probiotics work by increasing populations of beneficial microbes that break down organic material. This can help reduce sludge accumulation and improve overall system performance.
The objective of the project was to determine whether probiotics could:
- Reduce sludge accumulation in pit latrines
- Reduce odor
- Improve sanitation system usability
- Provide a practical solution for community-based sanitation programs
- 10 treatment systems received probiotic applications
- 5 systems served as controls
- Probiotic application procedures
- Monitoring activities
- Basic sanitation maintenance
How the Study Was Conducted
The pilot project took place between November 2023 and February 2024 in Barangay San Isidro.
Fifteen household sanitation systems participated in the study:
Researchers and community facilitators first assessed existing sanitation facilities and selected households with similar system characteristics.
Participating households received training on:
Sludge depth measurements were collected before treatment. Dosage levels were calculated based on sludge volume and containment system dimensions.
The treatment process included:
- Measuring initial sludge depth
- Applying an initial probiotic treatment
- Measuring sludge depth after one month
- Applying a second probiotic treatment
Community members actively participated throughout the project by helping with monitoring, observations, and product application.
Results: Reduced Sludge and Odor
The project produced measurable improvements in treated systems.
Significant Reduction in Sludge Depth
Average sludge depth decreased from approximately 240 mm to 160 mm following probiotic treatment.
Statistical analysis showed the reduction was highly significant (P < 0.001).
Several households experienced substantial decreases in sludge accumulation within the first month of treatment.
These results suggest that probiotic activity accelerated the breakdown of organic waste within the pit latrine systems.
Noticeable Odor Reduction
Community members and SIKAP Association leaders reported noticeable odor reduction during the project.
Many participants observed that odors decreased within the first month following treatment. Reduced odor improved the overall user experience and helped make sanitation facilities more comfortable to use.
Community Participation Was Key
One of the strengths of the project was the level of community involvement.
Residents participated in training, monitoring, data collection, and product application. Participants reported that the probiotic solution was:
- Easy to apply
- Safe to handle
- Easy to store
- Easy to transport
This level of participation helped build local ownership and demonstrated that probiotic sanitation programs can be managed successfully at the community level.
Lessons from the Project
The study reinforced several important lessons about sanitation management.
First, sanitation programs need to consider what happens after toilets are built. Long-term maintenance is essential for keeping systems functional.
Second, access points such as manholes make monitoring and maintenance much easier.
Third, communities are willing to adopt new approaches when they are practical, safe, and easy to implement.
What This Means for Community Sanitation
This pilot project demonstrated that probiotics can help improve pit latrine performance by reducing sludge accumulation and controlling odor.
The results also showed that community-led implementation is possible and can support long-term adoption.
As communities continue to look for affordable sanitation solutions, biological approaches such as probiotics offer a practical tool for improving existing systems without major infrastructure changes.
About SCD Probiotics
SCD Probiotics develops biological solutions for wastewater treatment, agriculture, composting, environmental sustainability, and human health. For more than 20 years, SCD has focused on using beneficial microbes to improve system performance while supporting environmental stewardship.
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