18x28x1 Exact MERV 13 AC Furnace Filters 6 Pack double-ended The unit is provided with

The unit is provided with high impedance pH input and can be used with any pH electrode with standard BNC connector

Enhances nutrient uptake and absorption

Black Spot

You can also Complete chip & 'T' buds

Completely submersible sump pump features a 1/6 HP oil-free motor with thermal protection

18x28x1 Exact MERV 13 AC Furnace Filters 6 Pack double-ended The unit is provided withNordic 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