I find this dispenser is doing an average job of dispensing chlorine-from puck form. I am unimpressed how there are chunks of chlorine releasing from the slatted openings. Either the puck is not breaking down well (which I suspect) or the slats on the dispenser should be more of a mesh than an entire slot opening. It's durable enough, easy enough to use..... it's just the chlorine is flaking into the pool prior to dissolving so we're left with chlorine chunks releasing into the pool.