On my boat I have a marine toilet. It is operated with salt water.
The problem is, on the interior of the outflow tubing it accumulates some sort of hard grime. I am looking for a good way to dissolve this grime as it is impossible to replace the tubing.
From experience it is known that citric acid work - but not very well. Also it leaves a "sandy" residue that is difficult to flush.
Does anybody have an idea of what this "grime" consists of - and thus how best to dissolve it?
On hand I have:
- citric acid
- 56% phosphoric acid
- 23% HCl
- tubing: PVC
- toilet itself: porcelain
- pump: ABS or polypropylene with selected parts in acetal resin, with 316 passivated stainless steel fastenings, brass weights and neoprene seals and gaskets
- valve: grey, harder plastic
I know this quite vague but am hoping somebody can help anyway.