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Grower's Edge Block Covers 4 in (40/Pack) For blocks of rockwool and other grow media. Grower's Edge® Block Covers block light from media—which helps reduce algae. Use white side up to reflect light. Use toothpick to hold cover in place. Hole in center of cover measures 1/2 inch in diameter.
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🇺🇸 Ship from USA · On Agora since 2025
$11.99