Grodan Pro MM 40/40 6/15 Plugs, 1.5" x 1.5" x 1.5", 2250 per box, Commercial spl_hrg while the single-bucket Root Spa

while the single-bucket Root Spa systems use a single dedicated air pump

a naturally occurring biocide

Precisely balanced for vibration-free operation and longer life expectancy

Reduces watering and leaching of nutrients

Grodan Pro MM 40/40 6/15 Plugs, 1.5" x 1.5" x 1.5", 2250 per box, Commercial spl_hrg while the single-bucket Root SpaGrodan Stonewool (rockwool) is made from molten rock spun into cotton candy like fibers and then compressed into cubes, blocks, or slabs. Where other rockwool brand manufacturers cut all sizes from one batch of wool, Grodan is unique by making different types of fibers. The purpose is to support the requirement of the plant in the different plant stages. Grodan has a tremendous capacity for absorbing nutrient solution while retaining plenty of oxygen