I start the season by running sterilizing solution through the system. I use baby bottle tablets, others use Miltons, no reason why you could not use a weak bleach solution. If you did this at the end of the year it could have the effect you are after.

Colin

I thought about that a while ago. I know my tubes [oh missus, sounds painful] are plastic as is my tank. My tap bodies will be brass with chrome plating. I would hope my Truma water heater is stainless steel, so I should be OK. If not then I'll change my ways.

Colin

Wenn Sie hier auf Links zu eBay klicken und einen Kauf tätigen, kann dies dazu führen, dass diese Website eine Provision erhält.

You boys are so extravagant, but you've talked me into it, £7.98 and it should last me about 5 or 6 years. Werbung: https://www.ebay.co.uk/itm/Puriclean-400...er/162983955421

Colin

Update.
At start of the season I roll a cloth up, soak in a dilute bleach solution and push it into the outside fill tube that feeds my onboard tank. This is clear and gets the same black build up in it. After 24hrs I've pulled this out but not that impressed so thought I'd take the tube out and do the job properly. After undoing the jubilee clips it became apparent this is not possible. The tube is short and stiff, the outside filler obviously fixed and so is the tank as it's glued to the floor and the waste outlet through the bottom means I'm not going to move it. I've rotated the tube 180 degrees, showing even more gunk, and now repeating the soaked rag. Next step will be to try and fit a bung in the entrance to the tank and fill the tube with bleach water.

Colin