I got a brand new HM 4.8 w/ salsa two years ago. It came with an APO but I had not used it because I didn't want to have something else to maintain(that and I would forget I had it). Anyways, I've used it twice this past week and it saves a bunch of time. I think I will use it more often. How is everyone using theirs? How do you maintain the pump from clogging up? Thanks.