GrowFAQ:

Will a slow sand/rockwool filter out my hydroponic nutrients?

  Added by: Cobber  Last edited by: administrator  Viewed: 391 times  Not Yet Rated
No. A slow sand/rockwool filter will not filter out any of the nutrients in your system. The bacteria in the filter will use a very small amount of nutrients to grow and multiply, but it is negligible. Slow sand/rockwool filters only filter out bacteria, viruses and fungi.
  Last modified: 00:20 - Mar 04, 2001 

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