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works great with 20 gallon industrial Rubbermaid tubs
If your Ph is getting too high
due to its low molecular weight for uptake
• Use on vegetables
Duct Fan Silencer 4 - Duct Fan Silencer for 4" Duct Fan microbial fertilizer works great with 20 gallonA duct muffler designed for use with inline fans in grow tents, bathroom fans and other HVAC applications. Features dual aluminum flanges to help absorb sound waves from fan vibrations and airflow. High quality neoprene foam in an egg crate pattern that will reduce fan noise by up to 50%. Galvanized steel body that is corrosion resistant and can withstand extreme temperatures. Duct Opening Diameter: 4 inches Length: 15 inches Weight: 2. 30 pounds
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