Rockwool Block Covers refurbished-products Up to 30' lamp striking

Up to 30' lamp striking distance: Separate the ballast from your reflector by 30' of distance if necessary (optional lamp cord extensions may be needed)

but can be costly and inefficient when using bottled CO2 tanks

May be added to nutrient solution reservoirs

or as a stand alone dechlorinating and sediment filter

Rockwool Block Covers refurbished-products Up to 30' lamp strikingPLASTIC 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