Ha, I used to go through gallons of Star San when I brewed beer. My wife uses it for sanitizing fungus growing chambers, but I've never used it for cannabis. I also grow in coco so no experience with sanitizing DWC. For cleaning I use a general spray cleaner on all surfaces followed by some Dr Zymes (citric acid mostly). This seems to do the trick and keep the nasties away, but cannabis is much more forgiving that wort regarding sanitization practices.