Black fragments in flush tank

Many of us have found that Aqua Kem pink flush causes the black bits.  Try using a different brand.  I've given up with it altogether and add a few drops of scented Zoflora to my flush tank.

Skyrod67,  welcome  to  the  weird  &  wonderful  world  of  motorcaravanning  !!    Many  of  us  have  vans  which  are  not  fitted  with  separate  "Flush  water  tanks"  so  we  use  any  of  the  "pink"  sprays  from  Elsan,  Dometic  or  suchlike  companies.  Others  Like  Jill-w-a-J,  use  an  air  freshener  or  spray  suitable   for their  own  delicate  noses !!  After  a  while  not  using  the  Pink  Fluid  you  should  find  the  Black  Bit  problem  disappears

We gave ours a couple of good rinses with clear water, flushing right through and the black bits finally stopped appearing.

To clean the flush tank,  I believe Thetford suggest using a solution of Milton, but we use Puriclean, which is good for the drinking water system too, as it removes bio-film.

We generally just use plain water in the tank as we previously did not have a separate flush tank so are not used to using "pink", but even then find the occasional "black bit", mainly at the start of a trip.

I think it may be due to the interior or the tank being constantly wet and encouraging the growth of the bio-film.

Using fabric softener in the flush tank, instead of "pink",  has also been suggested, haven't tried that myself.

Me neither - quite happy with the Zoflora and it comes in a very small bottle which doesn't take any room in the cupboard.. 

Yes, I admit to recently changing over to Aqua kem pink.

So its back to what I was using before after giving the tank a good flush out.

Thanks for your advice folks.

Is  that  what  caused  Burl  Ives  to  sing  ??

A  Little  "Bitty"  tear  let  him  down   or  some  such 

Sorry,  I'd  get  my  coat  but  it's  too  warm,  bieeee

A B M