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I usually grow using a 70/30 coco/perlite blend. This next run, I’m going to change things up a bit, as I’m really starting to get things dialed in. I plan on using build a soils coco mineral kit, to hopefully cut out the calmag I’ve been adding to my RO water. I feed Megacrop which is already high in calcium, so I’m hoping running just Megacrop and RO will be fine with the mineral kit, so I can stop spending money on cal-mag.

My real question though, has anyone had success using biochar in place of perlite? I would use less, seems like 5-10% is the magic number. My main goal is to provide a better home for microbial life (I use Recharge during veg and I alternate between Mammoth P and soil balance pro during flower) without losing the aeration properties of perlite. Look forward to hearing everyone’s experiences.