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Square Block Covers 4" 40 Pack

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Square Block Covers 4" 40 Pack


Four-inch Block Covers are white on one side and black on the other to reflect light back to plants while preventing algae growth and deterring root zone pests. Ideal for rockwool and compatible with all growing media. Made of durable 8-mil polyethylene; pack of 40.

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Block Covers work great in reducing algae and pest control. The white side is good for reflecting light.

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