For hydroponics and indoor gardens water stays cleaner controls mold. Promotes healthier fuller plants. The green pad works by producing carbon dioxide (CO2)when activated by humidity or moisture. The green pad is made with a combination of carbons and acids that react to humidity and release a measured amount of CO2 for about a week. Co2 is the only anti-microbial gas in the atmosphere, the green pad and CO2 controls mold and algae growth in the water, containers and the surrounding enviornment resulting in lower maintenance and fuller healthier plants. Hang the green pad up high in your room so the CO2 can fall and surround the plants and water. Small tent rooms 4'x 4' x 8' or small bloom boxes may only need 1 green pad per week to maintain 1000 ppm. Misting the pad before closing the room increases concentration. Larger rooms 12' x 15' x 8' may use 2-4+ green pads per week levels depend on your air exchange and frequency of misting. Be sure to put new green pads in every week. Leave the older green pads in your room for 2 weeks before discarding . Keep the green pads exposed to humidity or moisture to maximize CO2 release FAQ'S How much humidity does it take to activate the Green Pad? It takes about 35+ % Humidity to activate and produce a measured release of CO2 Higher humdity or frequent light water misting increases activation. How many Green Pads do I need for my room? The Green Pad works best in small to mid size hobby gardens Use at least 1 pad per 400-500 cubic feet of space Add more Green Pads to increase CO2 Levels for larger rooms What level CO2 ppm can I expect using the Green Pad? Our tests in a room 10' x10' x10' (1000 cubic feet) with 3 Green Pads at 60% humidity and minimal air exchange produced 1000+ ppm The amount of fresh air exchange plays a major role in the containment of the CO2 and the levels maintained in the room. To maximize performance misting the pads before closing the room will increase concentrations.