It is absolutely easy to change the nutrient solution in your Waterfall Gardens' hydroponic units. For the Waterfall Tower, simply lift the Tower and reservoir cover out of the reservoir, empty the remaining solution into the drain (or use it to feed your earthbound plants), refill it up to the marked line with tap water, empty the two Nutrient Solution bottles (A & B) into the reservoir, replace the Tower and cover, plug it in and off you go. The wall is even easier because you don't have to remove the tubes. Still stuck? Check out the video below. So what are you waiting for - become a Waterfall Gardener and get healthy, homegrown hassle-free hydroponic produce today!