14x18x1 Exact MERV 13 AC Furnace Filters 6 Pack flowering nutrients Available in 10 sizes

Available in 10 sizes

These growing blocks are used for direct sowing or "blocking on" of Macro and Multiblock raised plants

LED indicators

it will keep insects off

Quickly and consistently measure moisture

14x18x1 Exact MERV 13 AC Furnace Filters 6 Pack flowering nutrients Available in 10 sizesNordic 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