Hey...I have a Dolphin 30i and after 20-30 min it stops in the pool. I have cleaned the impeller and still happening. I had a problem with calcium flakes in the pool and used the Dolphin to clean so I wonder if there is calcium in the filters, causing flow issues? I have spent the afternoon with filters in MA and rinsing several times. Doesn't seem to be helping yet. Every time I put them back in acid I get a lot of bubbles so maybe I need to just keep repeating until no bubbles. Any thoughts?