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Quote: Originally posted by Chapelgirl on 15/8/2011

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Thanks Jeff. I have checked on their website here: Puriclean and the active ingredient Sodium Dichloroisocyanurate (NaDCC) is exactly the same as what is in Milton tablets. See here: Milton so I should be OK with the Milton too.

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Quote: According to Miltons own website "The Milton Sterilising Fluid is a 2% aqueous solution of sodium hypochlorite that contains 16.5% salt. " From my limited knowledge it is the sodium hypochlorite that does the damage to seal ets.

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Yes, but I am talking about the Milton TABLETS, which are of a different chemical composition, it would seem. Please check the packet if you don't believe me.

Quote: I will stick to making sure I use the correct concentration of flush and holding tank chemicals. An amazing number of people do not even know how much water they have added to the flush tank or what the capacity of the holding tank is.

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We are aware of the capacity of our holding tank, and have always used exactly the right amount of pink fluid. I carry an old washing machine detergent dosage ball to make sure I use the right amounts of chemicals.

Quote: The other thing that I tend to do is drain the flush tank before leaving the site. I simply drain it into a 5l container. I have found it is the over dosage of flush chemical and leaving it in the flush tank for extended periods that causes the problem. Thetford have always advised draining the flush tank prior to leaving site. this removes the chances of surges of liquid from damaging the system and keeps the overall weight of the 'van down.

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An excellent idea, unless you are touring and spending only one or 2 nights on each site. Our Thetford is there for when we are not on a site or for times when we don't want to leave the van to use the site loo, e.g. during the night. It is a Porta-Potti, so surges are realistically not an issue for us. I always empty and clean it when we get home, so the flush tank is never left more than a few days without being refilled due to use or emptied. If Thetford chemicals cannot handle that kind of use then in my opinion they are not worth having and you might as well use plain water.

We don't use anything in the flush tank just clean water.Never had a black bits.

Can't see why there is a need. You don't put anything in the cistern at home. Just a catch to make you spend more money