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  4 Inch Redrock Rockwool PRO Grow Block for Hydroponics | 6 Pack + Twin Canaries Chart

  $14.99 Buy product
• 

  6 inch Redrock Rockwool PRO Grow Block for Hydroponics | 12 Pack + Twin Canaries Chart

  $59.99 Buy product
• 

  Grodan 1.5″ Rockwool Starter Mini-Blocks + Twin Canaries Chart (45 Blocks)

  $15.99 Buy product
• 

  Grodan Rockwool Delta GRO Blocks | 4″ Cube – Pack of 6 | + Twin Canaries Chart

  $17.99 Buy product