Right now the In-Line chlorinator seems to have a vacuum lock, I have to go out and unscrew the cap while the pump is running and wait for it to fill. I have pulled the black water line off of it and there is positive flow... It doesn't happen every time but enough that it has become bothersome... My question is, has anyone of you have had this issue before? I have checked the black screen at the bottom so that's not it. What was the fix besides for you besides me having to replace the whole unit?