Good Video about ppm and what it means

Discussion in 'First Time Marijuana Growers' started by Tayanissa, Nov 3, 2010.

  1. #1 Tayanissa, Nov 3, 2010
    [ame=http://www.youtube.com/watch?v=nkLaRE6mz0M&feature=related]YouTube - Nutrients And TDS Meter[/ame]
     

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