16x36x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack Environmental Controllers When used as a foliar

When used as a foliar spray

Calibration and conductivity standard solutions

Use in conjunction with Success Nutrients plant food and supplements

ornamental olive trees or comice pear

Features include a long range igniter

16x36x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack Environmental Controllers When used as a foliarNordic Pure Custom MERV 13 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