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Block Covers Block covers block light from reaching media to reduce algae growth, while reflecting light to leaves. Black on one side, white on the other, these covers do a great job of protecting plants and promoting growth. Pack of 40. Available in 4" and 6" sizes Product ID: BLOCKCOVERS Category: Hydroponic Systems-Accessories-Net Cups & Pots choose size 6" Size $10.95 4" Size $6.95 Quantity

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