I gave the waterfarm 8 pack + res a go last round in comparison to the aeroflo 60. The buckets gave me nothing but a headache.
Balancing nutes was the biggest problem I had with the system, and what ended up burning all my girls with nuteburn. The way the system is designed is cool, because you just fill up the res and let the floatvalve and gravity fill them up. But what happens when you want to flush? I was told buy the guy at the hydrostore that i'd have to take off the top part of the res, then use a wetvac to suck all the water out of the lower res and hope that it would suck from the buckets too. This became quite the hassle as when you're flushing often to keep things healthy and to switch from veg to flower. I ended up having to harvest a crop of sub-grade buds early and just made hash from it instead of smoking any of it.
Bottom line, I feel like I wasted 250 on the setup thinking it'd be a good budget alternative. And now i'm stuck with a system I can't resell and out 4 months time, and only a small amount of hash to show for it.
I hate to seem like the hater of the waterfarm modules, but I just don't want anyone to have the same headaches I had with them and feel like shit after wasting time and money.
