flow through the sump

[Delphinus]

Hmmm, mags *should* be able handle a little bit of pressure. I don't think I would dial it down past half, but it's just perceived as head pressure. They're usually awesome little workhorses. I wonder if you had a bad pump Danny? I've been running my beckett skimmer for like 4 years now on a Mag18. IME Mags usually just go and go and go. I finally threw out a mag 7 after about 10 years of use (I had bought it used in like 1998 or thereabouts) about a year or so ago, but it was because the impeller had developed a wobble, and basically had ground out the bearing hole. Ie. I couldn't just get a new impeller as the hole for the impeller shaft actually became oval.