Hoffman Volcanic Lava Rock Black, 2 qt LED Grow Light Controllers acting as the first line

acting as the first line of defense against particles that can clog up the charcoal bed

Unlike common duct fans that use an AC motor which is loud and unmanageable

In addition to insects and mites

Increases germination success

Controls and repels mites

Hoffman Volcanic Lava Rock Black, 2 qt LED Grow Light Controllers acting as the first lineVolcanic Lava Rock for Plants Hoffman Volcanic Black Lava Rock, is an ideal planting media for succulents and airplants. Its porous structure enhances air circulation and drainage, preventing root rot and promoting healthy growth. Perfect for small scale planting, this natural lava rock supports robust root systems while maintaining moisture balance. Size: 2 qt