I received an email about a week ago and they are going to have 20% off on some of their product.
Including some of the 600s you mentioned.
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I like 6x24" filters.
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Can-Lite & Phresh are a couple brands I’d recommend…
I’ve had quality issues with A/C but for a mid range filter it’s ok. I got cut on one because of poor craftsmenship. It’s also not keeping up with 4 flowering plants. Idk. I do have another one to replace it with.
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Mountain air is the best and @dbrn32 hit all the key points.
Going to the hardware store, buying a cheap furnace filter, cutting it open and wrapping it around the intake ducting will prolong the life of your filter. Change it each grow.
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