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Rainwater Filters

Graf Optimax® Filter

High efficiency, self-cleaning, below ground rainwater filtration system.

  • Over 95% yield
  • Self-cleaning filter
  • Max. 3,750 sq. ft. with 4" connections
  • Max. 7,500 sq. ft. with 6" connections

The Optimax is the most popular filter in the Graf filter lineup.

An excellent filter for both residential and small to medium sized commercial rainwater harvesting installations.

The Optimax® filter provides a highly efficient, low maintenance, self-cleaning solution.


  • Variable installation depth from 22-41 inches
  • Flush installation at ground level
  • Only 7" height offset between inlet and outlet
  • 0.35mm (.01") mesh filter
  • Lockable childproof cover
  • Telescopic riser (included), with natural looking lid, reduces cost, simplifies installation and produces professional looking results.