could just drain it into a 30 gal or so rubermaid tote and recycle the water every 3-4 days or whenev you get to your grow. or just to a sink or shower or laundry room floor drain if you don't care to keep it, etc.. (?)
at the dollar general down the street you can buy a 30 gallon rubbermaid tote for 10 bucks.. ? for sure a 5 gallon is gonna fill up pretty quickly if you are running full time, and if your homie isn't going to dump it daily, but ur existing system would work fine with just a bigger drainage resovoir.. then you could take care of it once a week or whatev you go to the grow? eh just suggestion i'm browsin the threads, best of luck, hope the herb turns out good enough to be worth the hassle mate