14x18x1 Exact MERV 13 AC Furnace Filters 6 Pack flowering nutrients These growing blocks are used

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

Optimize Coverage - 2ft × 2ft 0

The Hydro-x allows separate Day and Night settings for each of up to (4) TS  modules

Quickly and consistently measure moisture

PPF: 1716 umol/s

14x18x1 Exact MERV 13 AC Furnace Filters 6 Pack flowering nutrients These growing blocks are usedNordic 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