Fluval G6 External

http://www.externalaquariumfilters.co.uk/external-filter-reviews/fluval-external-filters/fluval-g6-external/

Penn-plax cascade 600 internal filter for aquariums up to 200 litres

http://www.rocketaquatics.co.uk/pennplax-cascade-internal-filter-aquariums-litres-p-149.html

The Story of ADA Super Jet Filters: A Note from Takashi Amano

http://www.thegreenmachineonline.com/articles/news/the-story-ada-super-jet-filters-note-takashi-amano?utm_source=The+Green+Machine+Aquatics+Newsletter&utm_campaign=687c13f065-July_2011_Newsletter_6_19_2011&utm_medium=email&mc_cid=687c13f065&mc_eid=f9ba6da540

How to Prime a Fish Tank Pump

http://www.ehow.com/how_4854278_prime-fish-tank-pump.html