The cistern tanks are not designed to be used above ground. They must be put in the ground. You have to backfill the tank with sand or gravel. Under the tank, there has to be a 6" bed of sand or gravel in soil terrain and a 12" bed of sand or gravel in rocky terrain. It has to have a minimum of 8" to 36" sand or gravel on top of the tank. You also need between 12" to 18" of sand or gravel to fill in around the side walls of the tank. Backfilling should be done uniformly around the tank. Never backfill at one end only.
Title: Can the Cistern tanks only be used buried in the ground?
Description: Information on burying the cistern tanks.
Published: 6/18/2008
Last Edited: 1/16/2023
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