Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

If the tank is clean it would be safe, but mine has a slimy film inside, so I toss it out.

Hi Kevin
This water can be stored OK without Algae build up just add a couple of drops of Milton baby feeding bottle steraliser to your storage container my Steam model loco group use this also for storing rain water.

Paul.

Bonjour,
Be careful, demineralized water will tend to want to remineralize, which it will do by attacking the metal that receives it.
Do not hesitate to use tap water from time to time, provided of course if it is not (too) calcareous and completely empty the boiler when it is not in use. Personally, I put it under atmospheric pressure and put aside its filling cap to avoid the rising of lubricating oil.