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Perlite: maintains air space for optimum root growth
Refer to the manufacturer's label (DOCS tab) for full crop-specific rates and timing
HLG BLACKBIRD is designed for home grows and is perfect for 4x4 grow tents
per pack: 1
22x30x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack Plant Support Perlite: maintains air space forNordic 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
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