Blocked | Soakaway

If you are currently experiencing drainage issues, let me know:

In soakaways receiving septic tank effluent, anaerobic bacteria produce a slimy organic layer (biomat) at the soil interface. While a thin biomat aids treatment, excessive thickness completely seals the soil pores. This is often irreversible without replacing the drainage field.

Before we dive into the nitty-gritty, let's quickly explain what a soakaway is. A soakaway, also known as a soak pit or rainwater soakaway, is a underground system designed to collect and filter rainwater, allowing it to slowly percolate into the ground. This helps to:

For more information on soakaways and drainage, check out these resources: soakaway blocked

The moisture-rich environment of a soakaway attracts tree and shrub roots. Fine root hairs penetrate the perforated pipes and geotextile lining, growing into dense masses that physically block water flow and disrupt the structural integrity of the pit. 4. Structural Collapse

If DIY solutions don't work, or if you're unsure about the cause of the blockage, it's time to call a professional. A qualified technician will:

Stay dry and happy DIY-ing!

The Complete Guide to Managing a Blocked Soakaway: Causes, Signs, and Practical Solutions

Direct Comparison: DIY Methods vs. Professional Intervention Remediation Strategy Best Suited For Cost Level Risk Factor Expected Success Rate Silt accumulation at the entry point Negligible High for entry blocks Chemical Additives Mild biological clogging / Biomat reduction High-Pressure Jetting Pipe blockages or soft silt buildup Low to Medium High for pipe issues Mechanical Root Cutting Heavy root infestation inside pipes High (Temporary fix) Total Excavation & Rebuild Structural collapse or soil compaction 100% (Permanent fix)

A soakaway (or infiltration trench) is a subsurface structure designed to disperse stormwater or treated effluent into the surrounding soil, thereby reducing surface runoff and recharging groundwater. When a soakaway becomes blocked, its infiltration capacity drops drastically, leading to surface flooding, structural damage, and environmental hazards. This paper examines the primary causes of soakaway blockage—namely sedimentation, biological clogging, and inappropriate waste disposal—and outlines diagnostic techniques and remedial strategies. If you are currently experiencing drainage issues, let

For soakaways failing due to septic tank effluent slime (biomat) or sodium-bound clay, specialized chemical treatments can help. Introducing concentrated biological enzymes or calcium nitrate into the system can break down organic crusts and loosen compacted clay soil, restoring natural porosity. Step 5: Excavation and Replacement (The Ultimate Resort)

Pouring fats, oils, grease (FOG), or non-biodegradable items (wet wipes, sanitary products) into drains leading to a soakaway will cause rapid blockage. Unlike sewer systems, soakaways cannot be jet-washed easily to remove such materials.