Plastic Septic Tank :: Installation Instructions

Siting:

• Sewage system should be as far away from habitable buildings as is economically possible.
• Good road access should be provided to enable tank-emptying vehicles to operate its suction-lift capabilities.

Excavation:

• Trench shall be excavated to approximate size of the tank.
• The bottom of the trench should be level and there should be no sharp rocks.
• Recommended coverage over the tank should be approximately 18".
• Second trench approximately the size of the tank should be excavated for the soak away-pit.
• This should be approximately 3m away from the septic tank.
• Preferably made in the direction of flow of water.

Tank installation:

• Tank should be lowered slowly into the pit. (Ensure base is completely even with no sharp objects.)
• It is recommended that piping connection is made at least 18" below ground level and checked.
• Fill the septic tank with water, till water flows into the soak-away pit. (This is required during installation).

Back-fill for Septic Tanks:

• Material should be free of sharp rocks.
• Material should be packed (by hand or foot) at the base evenly.
• Tank should be filled with water.
• If installation is in soils that leave large voids on back filling, it should be packed with gravel or sand.

Back-fill for soak-away pit:

• Trench should be packed with large rocks.
• The top 18" or so should be packed with finer gravel and then mud to ensure attractive surroundings.

NB: Safety:

It is recommended that heavy equipment should not be operated over any septic system. It is suggested that the area should be adequately fenced to prevent potential accidents and authorized interference.