yes i have also lookd at all sorts of different homemade carbon filters and have heard good feedback and its reaaal cheap..but i have also read that they do not work as well as one bought off ebay or an actual gardening store? is this true or no? i just have had trouble finding the right fan for a homemade filter becuz i need one with a switch to control the fan speed, as quiet as possible and inexpensive...any suggestions