Cassette toilet additives

I believe, though I'm not certain, that Thetford and AquaChem are formaldehyde free, while Elsan's fluid did once contain it,  they seem to be focussed on organic fluids now which they claim to exceed British Standards. We use bio pods which are frequently recommended on this forum, and are cheaper. If you are concerned about a specific product, then it's ingredients, or the manufacturers contact details can be found on the internet.

As far as I know.  You shouldn't empty a toilet cassette with blue chemicals into a septic tank.  That's where it might kill the bacteria.   In a mains sewage system it is going to be so diluted that it won't do any harm.  Also as far as I know Elsan blue still contains formaldehyde.  The 2015 msds indicates that it does.  A quick look at the Elsan site will show that only the blue fluid makes any claims regarding British standards and killing bacteria.  Then green fluid makes non specific claims about reducing smells and more marketing BS ( not British standard )

I know that this is a unpopular position.  But I put nasty poisonous toxic chemicals into my toilet cassette.  Because they kill the nasty potentially  pathogenic bacteria that I put into the toilet. 

I have a very elderly septic tank and feel much better emptying bio pod waste from the cassette than the blue (which I used to do but with no apparent ill effects).  Each to their own Boff - but unless you have tried the bio pods you won't know how well they break down matter - and make the emptying easier - so it certainly indicates they work better! 

I think that this breaking down of matter is a bit of a con.  Toilet paper is designed to breakdown in water and so will fecal waste.  It is impossible to state the level of bacterial contamination without doing a microbiological analysis As you say each to their own.  Friends of ours who have moved to Spain say they can't use biological washing detergent because apparently it can contaminate the septic tank.   

You can definitely buy 'green' additives that allow you to put the waste in the sceptic tank.  As someone has already said the liquid is coloured green to allow you to differentiate from the more common blue.

Friends of ours who have moved to Spain say they can't use biological washing detergent because apparently it can contaminate the septic tank.

So they do not use Biological washing powder/liquid?

My feeling is that emptying the waste into a toilet or chemical waste point feeding into the mains is not a problem as the dilution by the time it gets there is enough to prevent it doing any damage. Non bio ones emptying into a septic tank probably are a problem though and this should be avoided.

Some people swear by bio pods but how something designed to clean clothes can work in a toilet I have no idea so it is simply guess work as to their real effectiveness.

Over the years I have visited hundreds of different types of campsites. Their Elsan points must either go into the mains system to the sewage works or their own very large septic tanks. From my experience not many say, "No Blue" 

Earlier this  year  I  went  to  Carradale  Bay  A S  on  Kintyre,  Scotland   and  the  on-line  information,  and  my  visit  to  Reception  clearly  stated  "ONLY  GREEN"  chemicals  to  be  used  !!  I  complied  like  any  good  Club  member  would,  but  I  never  bothered  asking  if  Green  referred  to  the  Ecological  Quality,  or  just  to  the  colour 

BUT  before  I posted  this  I  checked  my  memory  bank  and  at  Culloden  at  the  end  of  last  century,  the  new  arrivals  were  given  the  usual  hand-outs  which  contained  one  leaflet ( which  I  still  have !! )  saying  ONLY  BLUE  chemicals  to  be  used. 

I've stopped using toilet fluid these days.  Instead I use the 'tea bag' type - I think they are Aqua Chem?  Far more convenient than fluid.

David