Description

Free Delivery Around the Island
This Product is not Delivered to Rodrigues
Septic Tank Capacity: 1800L | 3000L | 4700L | 

Waste-water (black water from Toilet) enters the septic tank
 through a 110mm diameter pipe on which a venting pipe (Air
 Vent) should be connected. 
For each flush, waste-water flows down through the pipe
 picking up oxygen through the air vent pipe.

As waste-water enters the septic tank, it is segregated
 in three segments:

Segment A – Upper part of the septic tank consists of Fats,
 Oil and Grease (FOGs). 
In this zone, aerobic bacteria gradually degrade the FOGs.

Segment B – Middle part of the Septic tank is the Aerobic 
zone consisting of suspended matter, oxygen and aerobic bacteria. 
In this segment, the organic matter is degraded to form Carbon
 dioxide and Water. 
Carbon dioxide diffuse out through the Air vent.

Segment C – Anaerobic zone consist of sludge (mixed of
 settled solid degradable organic matter and dead cells
 of bacteria) and anaerobic bacteria. 
In the anaerobic process, carbon dioxide, hydrogen
 sulphide, methane and water are formed. 
These gasses get diffused out through the air vent pipe. 
The treated water passes through the pre-filter basket 
into the absorption pit.

SIZING OF SEPTIC TANKS
Average Waste-water generation per person: 180L/day
Retention Time for Treatment and Reaction:48H (2 days)
Volume Required for Treatment = Volume of Waste-water
 Generated
Volume of Waste-water generated in 48 hours =
 No. of Person x Wastewater Generated Per Person x 2
For example: A family of 5 persons will require a
 1,800 L Septic Tank (5 x 180 Lt  x 2)

INSTALLATION PROCESS
Step 1: Excavation: –
Dig to a depth that will provide a maximum of 300 mm
 of fine soil over the top of the Septic tank.
Allow 230 mm around the tank.
Step 2: Bedding: –
Allow for a minimum of 150 mm of compacted bedding
 material rock sand. Bed the rock sand and make sure
 the surface is  levelled. 
Placed the septic tank on the levelled bed.
The septic tank is supplied with PVC sleeves [internal
 diameter 110 mm] at the inlet and outlet.
The inlet and outlet pipes should be glued to the
 sleeves using standard PVC glue.
Step 3: Backfilling: –
Ensure the tank lid is properly screwed on the tank
 manhole.
 Fill the tank with water through the inlet as you
 backfill, keeping the water level even with the 
backfill level. 
This will prevent possible distortion of the tank and
 its manhole. 
Do not remove the lid until the end of the backfill process.
Backfill in layers of 200 mm at a time and properly compact
 each layer. Ensure to compact each end first. 
Compact the backfill under the inlet and outlet before
 fixing the pipes.
Maximum backfill over the top is 300 mm. 
Mound fine soil over the top to provide positive drainage
NOTE: In case the septic tank needs to be installed with more
 than 300mm of soil above its top, it must be protected by
 a heavy-duty concrete slab. 
THE SLAB MUST REST ON FIRM SOIL AROUND THE TANK
Step 4: Septic Extension: –
In case the manhole screwed lid does not reach the
 ground level, a septic extension will be required. 
Install the extension to the manhole outlet before
 starting the backfill process.
Make use of Duraco septic extension EXCLUSIVELY. 
The screwed lid supplied with septic will fit the
 septic extension.
Step 5: Leaching Field or Drain Field Material: –
The home sewer drain needs to slope at least ¼ inch per
 foot downhill to the inlet of the septic and the outlet
 pipe must cater for a downhill slope of 1/8 inch per foot
 to the absorption pit. 
The absorption pit should be at a distance of not more than
 3 m from the septic and its volume must be at least similar
 to that of the septic tank.

Maintenance:
To keep a septic tank functioning properly, it is advisable
 to have the septic tanks pumped every five years.
lf the septic tank has not been utilized for a long period,
 it is advisable to flush toilets several times to re-activate
 the aerobic process of the septic tank.
Caution:
Failure to comply with the points below voids the warranty
Do not install any tank in water saturated clay or in high
 water table. 
The tank may collapse and its content will escape.
Tanks are not fire-resistant. Do not store them near an open
 flame or heat in excess of 180°F,
Do not install any tank under the path of vehicles or heavy
 equipment unless protected by a heavy-duty concrete slab, 
without resting on the septic tank.
When the septic tank is pumped for normal maintenance; 
it should be refilled immediately.
Our septic tanks are designed for underground use only.
Protect the tank from sharp objects which could cause leakage.
Avoid abusive use of detergent