Hydrofarm Rockwool Block Cover, 6", Pack of 40

Power Lab Supply 1SKU: HGCOV4
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Title: 4" Rockwool Block Cover, pack of 40
Sale price$29.00 USD

Rockwool Block Cover




Reflect light to plant leaves, where it’s needed most. Block light from media. Eliminate algae and mildew growth. 40 dual sided block covers per pack. Works great with GRODAN Blocks.

  • Block light from media
  • Reflect light to plant leaves where it's needed most
  • Eliminate algae and mildew growth
  • 40 dual-sided block covers per pack
  • Reflects light back toward the plants
  • Works great with GRODAN blocks
  • Eliminates algae and mildew growth
  • Blocks light from media
  • Six inch square

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