Flush tank additives

Not all pink additive allows bacteria/black bits to form, Thetford does, but Elsan pink/red  certainly does not, i use it all the time now.

What do you want  ? To encourage bacterial action or to stop it.

For me i use fluids that stop it, and kills as many germs as possible.

For that, the cost of traditional fluids, i always use Elsan Blue, is worth it.

The black bits do indeed grow in the "pink flush fluid", I experimented by draining it off into a cleaned mineral water bottle at the end of the 2016 season. checked it in April 2017 and it was full of black bits and streamers that looked like floating cobwebs.

I'm not sure what to do for best when it comes to flush tank additives.  I posted on another thread that I had recently noticed a lot of gunge developing at the top of the flush tank after using various makes of pink additive for the last two years.  Sure enough, when I cleaned the tank out using a bio pod, there were bits of black developing - which have now been cleaned out.  The idea of using a fabric softener has its appeal - especially as  my wife complains that using just water tends to result in a smelly toilet.  However, when our last washing machine was being repaired, the engineer said that he never uses fabric softeners in his washing machine because they contain fats and this is what causes the black gunge to develop in the dispenser tray (and the rest of the machine) particularly if it is used regularly on a low temperature wash.  So - it would appear that whatever you use, is going to cause problems.  The spray bottle seems to be the best solution! 

When I fill the flush tank I add a cap of zoflora , its a quid a bottle .

It does the trick .

I do find it strange that caravanners have been talked into buying additives for the flush tank where the contents are going straight to waste but very few indeed add anything to the Aquaroll, much of which is going to be swallowed by the caravanners.

The only reason I started to use bio pods was because a member posted that they could be used. I thought I would try it and I found that the 'break down' of the solids was much more efficient particularly if the tank is swirled (do this with care and make sure your seals are in good condition!!!) before the emptying process. I found that I wasn't fighting a 'cling on' and cursing under my breath ' come out you bugger!'while filling it with fresh water another 2 or 3 times to achieve a cleared tank!  Everything was liquified and emptied really well. It doesn't happen every time but it is generally much better than blue and I don't have to worry about an accidental spill which would be a disaster! That alone was worth the experiment. I use a highly scented fabric conditioner in the flush tank and have a small spray bottle of zoflora around the bowl if needed. Can't see me going back to blue and pink ......or EHU for that matter

I like that idea ,Wye. Zoflora is a powerful disinfectant 

Previously I used the pink additive made by Blue Diamond and had a problem with black bits, to such an extent that the bits blocked the pump and stopped it working, so no more pink additive.

I would be happy to use Lidl bio pods in the waste tank, but not in my flushing header tank, because the bio liquid is contained in the clear gel like sachet. Even though it is 'meant' to dissolve it could still block the pump if it doesn't dissolve fully.

im glad we dont have a flush header tank.....soooo many different options....

the black waste tank os currently on Aldi Almat bio gel pods (lavender, we like to try different ones.....) but i dont think they are as good as the Lidl bio gel pods.

i only tried Aldi as we have a new store nearby, back to Lidl when these run out.

incidently, for those who travel abroad, i could find any (marked) bio pods in Lidl in Spain, so will take a supply with me next time.

No Nuggy my old mate, bio pods ONLY IN THE WASTE TANK. Fabric Conditioner in the flush tank.