You've redesigned Chernobyl!
You don't want that forward tank--which I'm 90% sure is the SeaLand SanX/TDX tank. When it worked it was a nightmare that uses a chemical called TDX --a formaldehyde based witches brew--and barely treated to legal
standards...the discharge is an ugly mustard color that STINKS! Although the chemical TDX is still available parts
for the system aren't, and havent' been for nearly a decade. I suspect yours doesn't work, which is why there's a second tank...a PO needed more holding capacity...but he just added a tank instead of pulling out the defunct system and installing a larger tank.
You will regret it if you try to salvage
ANYthing in the existing system. Start over and do it right...it'll cost you far less in the long run. Let Hop quote you for the components and materials....I'll be glad to work with both of you to spec it out.
As for the "Poo pump"...it may be salvageable, but if it's not, they don't cost much.
Hop, I wouldn't try to shoehorn the complete "hold 'n' treat" package into a 30' sailboat...the controls can be retrofitted to any holding tank
, which offers a lot more flexibility when it comes to locating the tank and treatment unit and also the size/shape of the tank and also the plumbing
options, so I'd go with all the components separately. It's actually LESS expensive than the "bundle."