Ok, that's all tidied up now, so I guess the page is finished. Really appreciate close scrutiny by a couple of people, just to ensure I've not made any howlers!.
I think having a separate wash tank page makes sense as it could then be used in conjunction with other processor types.
I've renamed all the processor pages so the group alphabetically in the index and I'm part way through the wash tank diagram. I will list this with the prefix of "processor" to keep things consistent.
Does anyone have experience of "bubble washing" where a reservoir of water sits below the bio and air is bubbled into the water carrying small amounts up into the bio with each bubble?