Listen, make it easy on ur self and hit eBay. Buy a larger R.O. membrane and a new flow rate adjuster. It costs maybe 40$. Then you can produce more water volume in 1/2 the time. If ur bathroom is near your grow site, use the tub as an extra water only reservoir. For cleaning, rinsing, flushing, makeup water etc....
You want a room like Jacks, be sure to follow his entire program. Coco, nute's, bulbs, prune technique. It's in the details.