Non-Woven Poly 6 Mil - Blackout - 25' x 150' Extension Sachets are sealed against light

Sachets are sealed against light and air and are ideal for on-the-spot calibration

- Programming allows to increase or to decrease the CO2 concentration (only during the lighting period)

Compatible with all Hydrofarm heat mats

AC brushless motor with steel blades and lubricated bearings

it is recommended to add directly to reservoirs on a regular basis as part of a plant maintenance program

Non-Woven Poly 6 Mil - Blackout - 25' x 150' Extension Sachets are sealed against lightThe Blackout Greenhouse poly ensures no light will reach your plants until you want it to! Blackout Poly is the ideal covering for light deprivation greenhouse setups and is black on one side with a reflective white outer layer to further prevent light penetration. Using blackout poly on your greenhouse is found to result in improved production and increased plant yield that comes from growing year round regardless of weather conditions, and it is