13x21_3/4x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack ph-ec-tds-meters-and-solutions It works by disrupting the

It works by disrupting the insects’ ability to breathe

Anti-skid soles provide enhanced traction to help prevent accidental slips as you work

Whitefliesand Mites

We use a proprietary blend of minerals in our Cal Mag formula to help boost plant yields in fruiting and flowering plant varieties

Prococo Chip-N-Fiber's high moisture retention

13x21_3/4x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack ph-ec-tds-meters-and-solutions It works by disrupting theNordic Pure Custom MERV 8 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