Active Air Carbon Filter 6 x 24 in - 550 CFM Liquid Nutrients This is measured in pH

This is measured in pH and a handy tool tool to measure the pH is our Bluelab pH Pen

The bag is a 30 gal

compact pen

Witness accelerated growth

Active Air Carbon Filter 6 x 24 in - 550 CFM Liquid Nutrients This is measured in pHActive Air Carbon Filters are loaded with virgin activated Australian Granular Carbon. This carbon absorbs VOC's (volatile organic compounds) thus trapping every odor molecule that passes through the filter onto the micro porous carbon surface! These filters are light weight and incredibly effective at removing the most potent and heavy odors. Each filter is machine packed and includes a pre filter. Features Attached flange 1. 8" carbon bed depth