Can you flush a very old system which has passivated steel or stainless steel piping, such as Truweld or Gecol?
Yes, you can, but we advise extreme caution, and you should always point out to the householder that you cannot guarantee that there will not be any leaks. These were ‘stop-gap’ materials used during a period (late sixties/early seventies) when there was a copper shortage, and were not expected to have a very long life. The passivated steel tube (similar dimensions to 15mm copper tube) was fabricated from sheet steel, folded over, seam welded and galvanised. Thirty years later it has generally corroded internally such that it is on borrowed time. The stainless steel tube supplied at that time was of a low quality and is prone to pitting corrosion, and again is on borrowed time. If in doubt, do not power flush the system. If you accept the job, use HYPER-FLUSH instead of FX2 – and always ask the householder to sign a disclaimer! Click here to see an example of suggested Disclaimer text.
