I know it sounds like a pointless question but I feed my girls from the drip trays from Week 2,when it comes to the flush do I need to flush the soil through or do I just water from the trays as usual with clean water
I do not water the soil I fill my spill tray and let the roots draw from the tray.
What I would like to know is if I will get salt build up and whether I should flush the soil at 5 weeks and at finish or just wait and see if I have any problems
Your the first person I've heard of that waters that way.The roots should not be coming out the bottom of the pot in a soil grow but if it worked for you than so be it.I would still flush the last week or so to remove excess salt and nute residue.