Block Cover 3 inch (40 pack)
Plastic Block Covers by Hydrofarm
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
Plastic Block Covers - Are a precut panda plastic (black one side and white on the other). They will reflect light to plant leaves - where it’s needed the most as well as block light to your media which can reduce and eliminate algae and mildew growth. Each pack contains 40 dual-sided block covers, available in two sizes, 3” square or 4” square.
