Not off hand, but I'm really really sure there's been a massive thread on this very topic, very recently. Try using the search tab - might be in the equipment forum rather than the MH one. Sorry I can't be more helpful.
We also use fenwicks top and tail works well and doesn't smell like porta loo
Cheapest place we have found to get it is halfords believe it or not
Pete
I use Elsan blue for the Top and bottom proper strength in bottom tank about quarter strength top tank and have done for the past 20 odd years with never any problems. Sorry but I am one of those who would only trust a chemical toilet controlled by Formaldehyde
Quote: Originally posted by maggie51 on 04/9/2015Why whats the difference using formaldehyde we use elsan blue . Just wondering thought they should all be safe
I have started to use WALEX tablets. These keep the tank smelling fresh all the time, to the top. This means a an additive to the flush tank is not needed. Useful for those MH's which have one tank for all purposes.