Having asked Iain if he has used them before, this was his reply:-
Iain Mortimer:-
No I hadnt, but had been following others who had done long term reviews after purchasing. As always sceptical about those given free for a review, call me a cynic. As i plan on this being long term caravan and with medical conditions everything will be used. I thought prevention better than cure. Also on the 630 the flush system is fed from onboard fresh water tank so no flush additives. Initial impressions very good but after six months i can give a better feedback.
He also referred me to this video:-
At 5 mins 18 on following video is 1 year review of the twusch. https://www.youtube.com/watch?v=bSBUr-ZhUZc
Randa