Rotoplastic Septic Tanks 500 Gallons.

10 year Manufacturer's Guarantee.

Installation Guideline 500GThe depth of the hole must be 86” or 102” with the manhole extension, and 112” in diameter. This provides enough space for the tank and an additional sidewall allowance of 18” which is necessary for compaction of backfill. The minimum backfill at the top should be 6” and the maximum 30” bedding should be well compacted with a sand and gravel mixture with a minimum depth of 10”

1. Ensure that the tank is in a level, vertical position and that the ports
   Marked “in” and “out” are in their correct positions.

2. Before backfilling, pump water into the tank to just below the “outlet”
   pipe.

3. Backfill to a minimum of 18” thickness. The backfill material must be
   Sand or well rounded aggregate of up to ½” in diameter, and free from large stones or sharp objects. Ram down around the tank.

4. Backfill cover should not exceed 30”
5. Upon pumping the tank for routine maintenance, the tank should be
   refilled immediately. The septic tank may collapse if left empty underground..

Installation Guide 750 G        10 year limited Warranty

Excavation

1 a. The hole must be 108" L 70" W and 99" H. This provides enough space for the tank with an additional sidewall allowance of 18", which is necessary for compaction of the backfill material.

2. The base must be firm an level.

The minimum backfill cover at the top should be 6".

Bedding

Bedding should be well compacted gravel mixture with a minimum depth of 6"

Dry ground Installation

1. Ensure that the tank is level and that the ports marked "IN" and "OUT" are in their correct positions.

2. Before backfilling, place 12" of water into the tank. Then keep the water level in the tank at the same height with the backfill as the backfilling progresses.

3. Begin to backfill at one at one end of the tank first, then continue around the perimeter of the tank in 12" layers. The backfill material must be well rounded aggregate and must be free from sharp objects. Tamp around the tank. Note: Never backfill on one side only- backfill around the tank uniformly.

Wet Ground Installation.

For areas with a high water table, the tank must be anchored securely in concrete.

1. At the base of the excavation, cast a concrete layer of 8" -10" thick. Ensure that the tank is level and that the ports marked "IN" and "OUT" are in their correct positions.

2. After the concrete has reached its initial set, place 12" of water into the tank. Continue to backfill around the tank with concrete, keeping the water level equal to that of the backfill material in order to equalise the pressure of the tank.

3. Backfill around the tank with concrete, ensuring a minimum thickness of 6"- 8".

WARNING

Upon pumping out the tank for routine maintenance, the tank should be refilled immediately. The septic tank may collapse if left empty underground.