OOOHHH!!!! That's what SIP means. I kept asking myself "Is that really just watering from the pan?" OK. That's actually not far off from what I currently do, but still materially different. I have organic composting soil (not quite super because I keep having to add
nutes) and I water from the top, but I water until the whole bag is pretty darn wet (a gallon for a 3 gallon bag). Each bag sits in a deep pan and I let the water come out the bottom because it will suck it back in within a few hours. I worried that if I just fed from below, I'd end up with a bag of muddy root rot. I'll look into it further to see what'll work for me.
Thanks!