13x21_3/4x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack spl_jondon High-pressure pH probe - easy

High-pressure pH probe - easy to clean and calibrate

FloraLife Crystal Clear® powder and clear liquid flower food encourages the flower to properly start opening

A-OK Starter Plugs for starting seeds and rooting of cuttings prior to plugging into the larger Gro-Blocks

Crioceris duodecimpunctata)

This revolutionary filter will keep your air cooled reflectors

13x21_3/4x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack spl_jondon High-pressure pH probe - easyNordic Pure Custom MERV 10 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition