Humphrey MSD’s

Humphrey MSD Systems:

Just wondering what sort of engineering and operational modifications others have made to get/keep these systems operating reliably over the years. I’ve never seen one of these systems operate reliably without some sort of modification, and I’ve seen way too many Humphreys over the years.

I know this is an old thread but maybe my post will help someone.

My current vessel has a Humphrey the mods are as follows:

Added aquarium pump and stones to effluent to kill anaerobic bacteria and provide ventilation.

Changed float switch to an aquarium type mounted on top of second tank.

My controls have a two pole contactor controlled by a timing relay. When the float activates the relay it pumps just enough effluent, ie does not run the pump dry and does not overflow the charcoal tank.

I have been using rid-x instead of the Humphrey enzymes.

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if it’s any help since you’re not getting a lot of response: I’d flush the hell out of it with real hot water. I think i had a humphrey once but don’t recall much but then I tend to forget the bad stuff?

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