Grodan Delta 4 Block 3 in x 3 in x 2.5 in w/ Hole (48/Cs) Ideal for air movement from

Ideal for air movement from an air pump to air stones

For best results

Protect your Dosatron Nutrient Delivery System with all the necessary accessories for a successful installation

Its unique formula also allows for outstanding control of powdery mildew found in the garden

Grodan Delta 4 Block 3 in x 3 in x 2.5 in w/ Hole (48/Cs) Ideal for air movement fromGro Blocks are similar to a plant container. Need a 3 in pot? Then choose a 3 in Gro Block. Small plants can be fully grown in our larger Gro Blocks. Holes are perfect size for any 1. 5 in starter plug. Come in packs labeled with instructions. Big Mama is Grodan's largest block ever produced! Big enough to grow a large plant for its entire life. More than twice the amount of wool as our Hugo Block.