Hi and welcome from us in OZ also

Mary has given you some wonderful advice O0
I don't use a disinfectant to clean out our boys house, i use a mild detergent and then very carefullly wipe out again with clean water and then dry it with another cloth and then also let it air O0
I'd be getting the piggies to the vet and asking for some poop and urine tests also, it sounds like they maybe inbred? were they ex breeding piggies maybe they've had too many litters... so many possabilities :-\ :-\
RIP piggies 0

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run free at the bridge, there's lots of lovely piggies for you to play with and they'll show you where all the best grass and dandelions are to munch on :-* :-* :-* :-* :-* :-*
As for ribena i too was advised to use this when our little guy was very ill, he didn't like it, but i do know of people who use it, but they do dilute it quite a bit and make sure their piggies have plain water to drink as well. Hope we've all been able to help you even just a little. Again i'm so sorry for your losses it's never easy to loose a little one and you've been so unlucky to loose so many :'( :'( :'( :'( :'(
Let us know how you go O0