Installation Manual:
AdvanTex
®
AX20-RT Treatment Units
NIM-ATX-AXRT-1
Rev. 1.0, 1/10
© 2010 Orenco Systems
®
Inc.
Step 2: Excavate and Set Septic Tank
This section covers excavating a hole for the septic tank and set-
ting the tank. For information on excavating a hole for the AX20-
RT unit, see Step 4.
Consider the necessary elevations and grade requirements for the
tank and the AX20-RT unit before excavating the hole for the
septic tank.
The septic tank must be set deep enough to allow for a minimum
slope of
1
⁄
8
in. per foot (10 mm per meter or 1%) from the outlet
of the septic tank to the inlet of AX20-RT if the septic tank uses a
gravity discharge. Also, keep in mind that the AX20-RT needs to
sit 2 inches (50 mm) above final grade.
Step 2a:
Outline an excavation area (with chalk, paint, string, etc.)
for the tank.
Step 2b:
Excavate the hole for the septic tank following the
tank manufacturer’s recommendations. Remember that you need
the correct depth for a consistent slope of
1
⁄
8
in. per foot
(10 mm per meter or 1%) from the septic tank outlet to the inlet
of the AX20-RT.
Step 2c:
Make sure the bottom of the excavation is free of
debris, especially rocks and other sharp objects. If the bottom of
the excavation is uneven or rocky, lay a 4-in. (100-mm) bed of
sand or pea gravel and compact the material to create an even,
smooth surface.
Step 2d:
Set the tank following the manufacturer’s instructions.
Follow the tank manufacturer’s guidelines for watertight testing,
antiflotation measures, and backfilling to the level of the top of
the tank. Do not backfill past the top of the tank at this time.
Step 3: Install Risers and Water Test Septic Tank
NOTE:
This section covers riser installations on septic tanks
using gravity discharge. Contact Orenco for riser installations
on septic tanks using pump discharge.
Step 3a:
Be sure you are installing the right size risers for your
application and the size of the tank opening.
Step 3b:
Wipe the areas to be bonded with a clean rag to ensure a
clean, dry bonding surface.
5
2b
2b
