15x36x1 MERV 13 AC Furnace Filters 6 Pack Reflectors & Grow Lights Applying Defguard early and often

Applying Defguard early and often prevents bad fungi and bacteria from establishing themselves on leaves in the first place

This aggressive formula contains proprietary blends of calcium to ensure your plants thrive

Comes with protective case and calibration solution

MOLD AND MILDEW CONTROL  - DEODORIZER - DISINFECTANT

this superior steel is also resistant to oil based chemicals

15x36x1 MERV 13 AC Furnace Filters 6 Pack Reflectors & Grow Lights Applying Defguard early and oftenNordic Pure MERV 13 Pleated AC Furnace Air Filters provide exceptional filtration for both home and commercial environments. Each time air passes through a Nordic Pure pleated furnace air filter, lint, dust, pollen, bacteria, pet dander, dust mites, mold spores, smoke particles, virus carriers, coughs and sneezes, smog, allergens and other contaminants are removed. MERV 13 furnace filters are comparable to HVAC filters with the rating of MPR 2200