Prawn Connery
Well-Known Member
I don't use climate control, so temps vary. Right now (mid-winter), I'm recording temps of 10-25C. In summer, that will be around 15-20C minimum, and up to 35-40C maximum. ECs average 2.2. I run heavier to begin with (up to EC2.4) and tail off during the grow as salts build up in the coco. Though drain-to-waste does self-flush, salts still tend to build up in coco, especially inside the pot, and near the top, where there is a lot of evaporation. I use a hybrid organic/mineral salt nutrient (Canadian Xpress, also known as CX Nutrients), and a silica additive. I never used to use Cal-Mag under HPS, but I do under LED. There's less transpiration under LED, so the plants seem to like higher ECs to compensate.