21x23_1/2x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack nutrients This naturally occurring fungus is

This naturally occurring fungus is a common and aggressive predator of insect pests but is not a plant pathogenic organism and will not adversely affect beneficials (including bees)

This is the 1

especially with inert media and when using reverse osmosis (RO) water

AZOS Red Liquid is great for containers

Twister T2 Tightening Block

21x23_1/2x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack nutrients This naturally occurring fungus isNordic Pure Custom MERV 12 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition