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Adds 2 extra pre-filter stages
pH Down™ is an additive designed for use when you need to lower the pH into a more acidic range
will test at 8% or less
With Chlor a’ Clean
and University of Georgia define the top 1% of all fans tested by two key parameters:
18x28x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack flowering nutrients Adds 2 extra pre-filter stagesNordic 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
