Water Treatment:
Surface Tension:
http://hyperphysics.phy-astr.gsu.edu/hbase/surten.html#c3

Purification:
http://en.wikipedia.org/wiki/Water_purification

Ozone:
http://en.wikipedia.org/wiki/Ozone#Industrial_production
http://www.foodtechsource.com/emag/002/trend.htm
http://www1.eere.energy.gov/femp/pdfs/FTA_OTCT.pdf

Cooling tower: 
http://www.maintenanceresources.com/ReferenceLibrary/ezine/coolingtower.html
          
Electricity - Harmonics:
http://ecmweb.com/mag/electric_effects_harmonics_power_2/index.html
http://ecmweb.com/mag/electric_effects_harmonics_power/
http://www.bchydro.com/business/investigate/investigate961.html
http://www.cpccorp.com/harmonic.htm
http://www.copper.org/applications/electrical/pq/issues.html

Surges: 
http://www.zdnet.co.uk/tsearch/power+surge+electrical.htm
http://en.wikipedia.org/wiki/Surge_protector
http://computer.howstuffworks.com/surge-protector.htm                                                                                               http://www.torontohydro.com/electricsystem/residential/energy_news_views/articles/surge_protection/index.cfm

Power Factor:
http://en.wikipedia.org/wiki/Power_factor
http://www.hydroonebrampton.com/pdfs/PF_guide.pdf

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