Cistern Tank Installation Procedures


























1. Excavation


  • Backfill cover (A) may range from 6" to 30".
  • Sidewall and end wall allowance (B) should be 18'' to 24".


  • Bedding (C) should be a well compacted sand/gravel mixture: 6'' minimum in soil terrain, 12" minimum in rock terrain.









2. Lid and Manhole Extension


  • For proper fit, install the lid and/or manhole extension before you put water in the tank and backfill.
  • Please note the direction of flow - the inlet is higher than the outlet.







3. Installation of Bulkhead Fittings


  • Install bulkhead fitting in either side of manway or end rib as shown.


  • Tank must be vented.

  • Tank lid includes gasket and stainless steel screws for water-tight seal.








4. Backfilling Exterior and Filling with water


  • CAUTION: Start filling the tank with water when you begin to backfill, keeping the water level even with the backfill level-as you go.
  • Backfill in 12" maximum layers with a well compacted sand/gravel mixture. ALWAYS COMPACT ENDS FIRST.


  • Tamp and compact backfill under inlet and outlet pipe.








5. Backfilling the Top of Tank


  • Once the tank is filled with water, backfill to the surrounding level to a maximum of 30".











General Notes:


  • Do not install tank in water-saturated clay or in high water table.


  • Do not install tank across the path of vehicles or heavy equipment.



  • The tanks are designed for below ground use only.


  • For a water-tight seal, lid must be sealed with silicone caulking.


  • Cistern tanks should remain one-fourth full at all times.





Failure to comply with our installation procedures and general notes will void the warranty.





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