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What is the difference between the EPA terms MACT and RACT? I know acronyms stand for... MACT = Maximum Achievable Control Technology and RACT = Reasonably Achievable Control Technology But practically, what is the difference to a plant owner/operator?

Is there any easy way to chemically clean the CuNi tubes of a heat exchanger that are coated with calcium carbonate, etc. after water heater service?

I am counting out Pressure due to changing densities. Has anyone used the Resistance tape sensor from Consilium? www.consiliumus.com It looks like it would work with a Stillpipe to keep the foam and velocity off of it. Thanks for all the help so far.

The tank is 25 ft diameter. I found some info on Radar (Vega)that indicates that foam depth over a few inches could be a problem even for radar. The mixing is done with pumps which cause the foaming. If a standpipe would work, then why wouldn't a simple site glass? Maybe vent the top of the...

What would be the best method to measure the level in a tank which is: Acid, strong, various types, varying density, etc. Foaming present on top Particulate/solids collecting at bottom I am thinking Radar or Pressure, am I on the right track?

I have some questions about Air scouring of pipes for removal of scale, etc. Can anyone recommend a good description / reference for how to accomplish this? I gather that it is the injection of compressed air into the water supply to create more turbulence to loosen the crud off the pipes. Can...