Description
18x24x4 (3 5 8) Pleated MERV 15 Air Filters 2 Pack Water Filtration Nordic Pure 16x24x1 MERV 8 Nordic Pure 16x24x1 MERV 8 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer KALIX Phosphorus also contains 12% ammonium nitrogen which plants can utilize during bloom