Toilet Chemicals Longevity

Over the years we have regularly left the toilet with blue elsan in it after emptying it at our " last site of the year ".. It can be 2 or 3 months, and this year 8 months before we used it again with no obvious problem, so I wouldn't worry. 

I have always emptied ours and tend only to set it up as we leave for a trip. It would save scale building up if emptied.

David

Ditto, always leave fresh chemicals in cassette when not in use. That said, formaldehyde is biodegradable so maybe does lose efficiency over time?

We use the sachets as we prefer not to mess about measuring stuff out which usually ends up staining everything blue. 

So you could buy some sachets and just drop one down the opening to keep the concentration strength up if you're that worried but I suspect it would be fine. 

S/Bill,  Is the use of formaldehyde still permitted  ??

what is the life span of toilet chemicals left in the original bottle

Does it not have a use by date on it

peedee

Obviously, depending on how many trips out we do, the size of the bottle of blue that we buy usually lasts us all year.  We have, on occasion, had some left and used it the following Spring and never had any issues with its effectiveness.

I'm not a messy person so I don't have a problem in pouring it into the cassette from outside the van but I don't faff about measuring it; just a good glug and add about a litre of water.

Good question....so I asked Prof Google and it seems not. Now nitrate based biocide chemicals. Every day is a school day!

So I've done MY bit for the Environment for this Bank Holiday, then