I'm having some issues with my off-line chlorinator for a baby pool. The chlorine readings are through the roof even when I have the dial set to off. I opened the unit up and dumped everything out and noticed two things. One, is that there is no hard black screen on the bottom and two is there is water coming up through the bottom of the unit (which I thought is where it is supposed to exit). Should I order the screen and replacement elbow?