A newly unblocked soakaway will re-block within 6–24 months without changes upstream.
| | Action | Safety Note | |----------|------------|------------------| | 1 | Expose inspection chamber. Ventilate for 10 minutes (dangerous gases). | Wear gloves and goggles. | | 2 | Remove standing water with pump or bailer. | Do not pour into watercourse – silt-laden. | | 3 | Insert CCTV or endoscope if available. Confirm no collapse. | | | 4 | Insert high-pressure jetter with flail nozzle. Work nozzle in circles for 10 minutes. | Keep hose moving – can erode gravel. | | 5 | Extract water/debris. Check percolation: pour 50L water. If drains in <1 hour – success. | | | 6 | If still slow, repeat jetting, then add bacterial drain cleaner (follow label). | | | 7 | If no improvement after two jetting attempts – book excavation. | |
If the water table is naturally high (permanently wet hole), you cannot unblock – you must replace with a different drainage solution (e.g., attenuation tank with pump). unblocking a soakaway
Choose method based on diagnosis from Section 4.
A blocked or failed soakaway is a critical drainage issue that leads to surface flooding, waterlogging, structural dampness, and potential environmental health hazards. Unlike a blocked sewer pipe, a soakaway failure is rarely a simple “plunger” fix; it typically results from physical clogging (silt/debris), biological mats (bacterial/fungal growth), or hydraulic overloading. A newly unblocked soakaway will re-block within 6–24
Professional drain jetter (1500–3000 PSI) with a silt-reversing nozzle or flail nozzle . Process:
pipes leading to it rather than the pit itself. Check the Silt Trap: Many systems have a small catch-pit or silt trap. If this is full of debris, water can't reach the soakaway. Inspect Inspection Chambers: Open any manhole covers to see if water is backed up. If the chamber is full, the blockage is downstream toward the soakaway. 3. Methods to Unblock a Soakaway If the blockage is in the pipework, you can often DIY the fix. If the soakaway crate or pit itself is "blinded" (saturated with silt), the options are more limited. Drain Rodding: Use flexible drain rods to push through debris or compacted silt in the connecting pipes. High-Pressure Water Jetting: A professional service can use high-pressure hoses to blast away stubborn fat, oil, grease, or silt. This is often the most effective way to clear the lines. Chemical Treatments: Some specialized sulfuric acid-based cleaners can dissolve organic matter, but use these with extreme caution as they can damage the local ecosystem and soil quality. Mechanical Silt Removal: If your system has a silt trap, manually dig out the accumulated sludge using a shovel or a vacuum tanker service. 4. When Unblocking Fails: The "Blinded" Pit If the soil surrounding the soakaway has become clogged with fine particles (silt and clay), it is known as "blinding." In this case, the water has nowhere to go because the ground itself has lost its porosity. The Hard Truth: You cannot typically "unblock" the soil itself. If the pit is blinded, the only permanent solution is usually to | Wear gloves and goggles
Do not jet or dig until you confirm the problem.