GrowFAQ:

What will happen if I construct my own filter using maximum suggested flow rates and minimum suggested media depth?

  Added by: Cobber    Viewed: 950 times  Not Yet Rated
In a worst case scenario, your filter will not be 99.9% effective against all types of bacteria, viruses and fungi. Typically, you would still expect it to be no less than 94% effective against a range of pathogens.
  Last modified: 00:22 - Mar 04, 2001 

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faq:958 "What will happen if I construct my own filter using maximum suggested flow rates and minimum suggested media depth?"