20x24x4 (3 5/8) Pleated MERV 14 Air Filters 1 Pack PH/EC/TDS Meters and Solutions 1 to 3 ml A

1 to 3 ml A and 1 to 3 ml B per liter of water

Xx-Large - Case of 12 sleeves (12 units per sleeve)

Mild Vegetative Rate: 6 ml/gallon

The premium granules expand up to 7 times in volume when hydrated

Features eco-friendly recyclable packaging

20x24x4 (3 5/8) Pleated MERV 14 Air Filters 1 Pack PH/EC/TDS Meters and Solutions 1 to 3 ml ANordic Pure 20x24x4 Pleated Air Filters MERV 14 are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home. Each time air passes through a Nordic Pure pleated furnace filter, lint, household dust, pollen, dust mites, pet dander, smoke particles, smog, allergens, virus carriers, bacteria, mold spores and other contaminants are removed. All Nordic Pure pleated air filters are manufactured