Theoretically, if you're keeping the water clean and roots healthy, couldn't you just keep adding fresh water to the res? ...along with nutes and (hydroguard) ... maintaining desired ph and ppm. For how much the plants drink later in their lifespan, it seems to me the water would be completely, newly cycled every week or multiple times a week anyway, just by adding so much fresh water to top off the res. This is my first grow, and I'm just theorizing and planning for the best and easiest path. The plants seem so happy in the water they're in, and the water has no smell and the roots look fantastic. Seems I could just keep topping off and adding nutes to maintain the ppm range I'm going for. Has anyone had success doing it this way?