Yeah, seems to be a balancing act. I honestly only change my res once every two-three weeks during veg, and at least every 2 weeks in flowering. It just depends how big your res is imo. I think people tend to get a little too anal with it and dump a ton of money down the drain. I've heard of people not changing their res the entire time except when they flip to 12/12. I think that might be a little out there unless you had a massive res, and few plants or something. I think 2 weeks is a good rule of thumb. If you're growing out of a 5 gallon bucket though you probably want to do it every week imo.i've just been reading upon hydro feeding and from what i can gather you can do a couple of ways, firstly just top the res up with plain water to your res and dump out and refill once a week or you caan arse on daily taking ph readings and ec and work out how much food the plans taking on board and add nutes plus water.
the second being a shit load more precise but you'll constantly be riding the edge of whats happening balance wise. the first means you will constantly underfeed your plants. or there's the half way house of mixing a low amount of nutes but not just plain water.
I'm going to get a waterfarm and go with plan A first. then see if i can go onto the third option.
i like the cows hair cut.
Second time this year ive watched a HORRIBLE sports injury live. i saw that baltimore/pats game in the playoffs live too. those were both disturbing.http://www.youtube.com/watch?v=y7JeKO-GDa0
fuk me this funny and awfull all at the same time.
Kevin ware from louisville breaks his leg