Hi I hope this helps ...

Hi

I hope this helps support you in finding the solution to your problem as you do not make this clear -

One is biofilm in a potable water main is a natural thing and you must accept that you cannot control it and if you remove it from the pipe wall it will come back - usually within 28 days. We have been working alongside University of Sheffield in the UK on this subject over the last 7 years. Check out their website and articles on the internet - http://www.podds.co.uk/. I would ask why you need to control it? Are you having water quality issues that you are attributing to the biofilm? we have found our issue is not the film but the metal oxides -usually of Mn and Fe that are present in most potable systems sticking to the film and then remobilising when we exceed the energy equilibrium between the film and the pipewall - usually when we change flows in the main. You need to learn to manage this 'accumulation' over time as cleaning mains is not cost beneficial in the long term.

we combine our pipeline management approach, based on PODDS principles to successfully manage water quality risks in old and dirty mains quite successfully. we also do mains cleaning as part of our discolouration reduction strategy including ice pigging. NWG were the first company to successfully use ice pigging on a large scale in the UK. Whilst it is more cost beneficial per meter cleaned than jetting/relining I refer you back to my earlier point - unless you change the constituents of your water it all comes back!