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Bacfree Rainwater Harvesting System Design is Compliance to the following Rain Water Harvesting System Design Guidlines

A. Department of Irrigation and Drainage (DID) Malaysia:
Rainwater Harvesting Guidebook

Rainwater Filters

Rainwater quantity varies and is affected by environmental factors and commercial activities in the area. The addition of the rainwater filter will improve the quality of the water.The rainwater filter can be part of the rainwater downpipe, be separate from a tank or be attached to a tank. The rainwater filter also can be installed below ground.

”Chapter 6 – Page 33“

B.British Standard BS 8515:2009
Rainwater Harvesting System – Code of Practice

Filtration and Treatment

Filtration should be incorporated in the system before the collected rainwater enters the main body of stored water, to prevent debris accumulating in the tank
e.g. a filter may be placed in the collection pipe work upstream of the tank.
The filter system should include a filter which:

  • Is water and weather resistant
  • Is removable and readily accessible for maintenance purposes;
  • Has an efficiency of at least 90%
  • Passes a maximum particle size of <1.25mm

Additionally, to prevent any other floating debris from entering the distribution system, the storage tank should be fitted with a calmed inlet.
Where feasible, a floating extraction point from the tank should be used, which is approximately100mm to 150mm below the surface of the water. If floating extraction is not practicable, a fixed extraction

”Section 4.3 – Page 14“

C. German Standard DIN 1989-2001-10

Rainwater Harvesting System – Part 1 : Planning, Installation, Operation & Maintenance

  • Rainwater Harvesting System1
  • Rainwater Harvesting System2
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