Do any one know how packaged drinking water is processed?

Question

how yeast&mould is removed from packaged drinking water

Answer 1

Yes, not very well.

I worked on the case cited below - the California Attorney general even brought a consumer protection action against Crystal Geyser and numerous other bottled water companies because their bottled water was so contaminated.  Here's an excerpt from Envirolaw.org:

ELF vs. CRYSTAL GEYSER WATER COMPANY, et al.

ELF and NRDC tested hundreds of brands of bottled waters throughout the country, and found that 25% had some kind of contamination. ELF sued the companies in California that had contamination from lead, arsenic and bacteria. Every company agreed to clean up their act. Crystal Geyser in particular was an industry leader, and installed filtration systems to remove all arsenic even before the suit was resolved, and has since made generous contributions to protect drinking water throughout the state.

Answer 2

There are a few processes used for bottled water.  

Distillation is a process used where the water is boiled (generally at a negative pressure) causing 140-160F during evaporation.  Once water is in vapor form, very little contaminate is carried over into product water, however if over boiling occours, then there can be some carry over.  The boiling action will remove biological contamination, and mineral contaminants.  

Reverse osmosis is another popular processing method which uses semi-permeable membranes that allow pure water to be diffused out of influent when enough pressure is applied.  Reverse osmosis membranes won't allow cell structures, salts, or minerals to pass, and most commercial plants use either two or three cell sets to ensure product purity.  Reverse osmosis units run continuously and actually produce higher purity water the longer the unit is ran.  

Some bottling plants use carbon filtration to reduce ionic and chemical contaminants, and then pasturize water prior to bottling to eliminate biological contaminants.  Carbon filtration is sometimes used in conjunction with distillation or reverse osmosis production methods.  When used with distillation or reverse osmosis, pasturization is not required.  

Spring water is pasturized upon bottling to remove all biological contaminants, allowing minerals to remain in the water.

Answer 3

Well water is gassed with ozone and radiated with UV to kill contaminants, then bottled and packaged.

Answer 4

Most store bought drinking water comes out of a regular tap, same as you have at home in spite of what the label says. Water does not grow yeast or mold unless it is contaminated at the bottling plant. Save your money and get a Brita or Pur water pitcher with a filter, removes chlorine and sediment.