Grodan® Stonewool Delta Gro-Blocks & Big Mama Size:Grodan Delta 5.6 - 3 in Block 3 in x 3 in x 4 in w/ Hole (32/Cs) This revolutionary filter will keep

This revolutionary filter will keep your air-cooled reflectors

01 and an impressive pH accuracy of +/- 0

Simply plug it in and it is ready to go

Silent alarm for both high and low settings

Controls and monitors CO2 from 0 to 2000 parts per million (PPM)

Grodan® Stonewool Delta Gro-Blocks & Big Mama Size:Grodan Delta 5.6 - 3 in Block 3 in x 3 in x 4 in w/ Hole (32/Cs) This revolutionary filter will keepGro 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.