I've been very happy with these water farm units....I was a bit worried because I bought them on impulse and then started reading forums on growing after the fact...I haven't read about anyone recommending these units however, I have found them to be stupid proof.....Checking ph is done by simply tilting the blue hose into a container to fill.....Same with total nute change, liquids drain through blue hose....and then refill by pouring nute water over hydroton rocks.....Drip system is running while lights are on and no water when lights are off....Easy as 1-2-3....