15x19x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack Reflective & Greenhouse Films The 200 g desiccant packs

The 200 g desiccant packs are environmentally safe and can be disposed of as normal waste

When mixing with any phosphorus additives (like Elite 91 FLOWERS)

ballast compatibility

They are great for your rice cooker and slow cooker too

use Tundra at least bi-weekly while plants are flowering and/or fruiting

15x19x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack Reflective & Greenhouse Films The 200 g desiccant packsNordic 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