Spider Farmer 4 Inch Carbon Filter for Grow Tent, Air Carbon Filter with Premium Australia Virgin Charcoal for Grow Tent Fan, Grow Tents, Air Filtration, Hydroponics is up for auction in Patio, Lawn & Garden. The current bid is $10.50, 79% below the $49.99 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.