Photo below is of pea gravel in small laundry detergent bucket with holes drilled in bottom and around lower edges. Gravel came from AP community member Kip Edmond's system. Rather than mix the pea gravel with the Hydroton, I thought I'd see if this approach might work to inoculate my grow bed.
Also noticing wide swings in pH from a 6.5 at 9AM this morning to 8.0 at 5 PM. Will forego muriatic dosing this evening and take new samples tomorrow. Photos of each test are on http://facebook.com/firstwaveaquaponics
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