Keep algae at bay with Sunleaves Coco Covers made from 100 percent organic coconut fibers. At 6 inches across, these covers keep excess light out of rockwool cubes or pots that could otherwise foster algae growth. They're covered with a natural rubber latex coating and are heat-pressed to seal together. Coco Covers are about 3 millimeters thick with a 3/4-inch-diameter hole in the center that can be expanded to 2.75 inches.
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