Phat HEPA Intake Filter 4" HGC724645 It works by weakening the

It works by weakening the protective outer shell of soft-bodied insects

Key Features Non-toxic and non-nutritive - Safe to use on plants in and stage of growth

If the Steam Humidifier is draining too frequently

thoroughly covering all plant surfaces (including the bottom of the leaves) until the point of runoff

Phat HEPA Intake Filter 4" HGC724645 It works by weakening thePhat HEPA Intake Filter, 4" The tightly woven synthetic HEPA fibers in this filter will help prevent mold, bacteria, pollen, insects and plant pests from entering your growroom or greenhouse. The HEPA fibers block out most airborne particles down to . 3 microns in diameter. That is 300 times smaller than the diameter of a human hair. This is a serious insurance filter, without it you are leaving your grow room susceptible to the elements.