15x18x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack flowering nutrients 01 calibration buffer that is

01 calibration buffer that is NIST traceable and supplied with a Certificate of Analysis

They allow precise measurement of dry nutrients and supplements

Built-in overflow system delivers excess water and nutrients straight to the rootball

Gorilla Lite Line Grow Tents are professionally designed grow tents that are ideal for experts and perfect for beginners

• Perfect or both preventative applications and major fungal infestations

15x18x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack flowering nutrients 01 calibration buffer that isNordic Pure Custom MERV 12 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