Hydrofarm 4" Rockwool Block Cover, pack of 40 Agrobrite Water Soluble Hardener is designed

Water Soluble Hardener is designed for cool temperature climates

Large LCD display

• Multi-Nitrogen Sources

ensuring success with technically one of the best growing medias for your indoor garden

Hydrofarm 4" Rockwool Block Cover, pack of 40 Agrobrite Water Soluble Hardener is designedProduct Details PLASTIC BLOCK COVERS Reflect light to plant leaves, where its needed most. Block light from media. Eliminate algae and mildew growth. 40 dual sided block covers per pack. Works great with GRODAN Blocks. 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 Specs Attribute name Attribute value Barcodes 10638104945780 (GTIN) 638104945783 (UPC A)