So I run a system where I use 8 by 8 inch Rockwall cubes to grow and they sit in a covered 4 by 4 bin where I pump nutrients into but I do not drain. The plants soak up all the nutrients from the roots soaking in the bins. My question is when I flush i currently use a wand and spray on top of the cubes and after I'm done with hitting the cubes I suck out the excess water in the bins. Would it be better for me to pump the flush water into the bins and let the roots sit in the flush water or am I doing the right thing by sucking the water out of the bins?