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Official web-site of the South African Department of Water Affairs http://www.dwaf.gov.za/

Endangered Wildlife Trust www.ewt.org.za

American Water Works Association http://www.awwa.org/

Aquaculture Association of South Africa http://www.aasa-aqua.co.za/

Aquaponics http://www.aquaponics.com/

Hydroponics http://www.gtghydroponics.com/faq/hydroponics.htm

Lovibond international site http://www.lovibond.de/

Metric Conversion Chart http://www.engnet.co.za/tips/convert.asp