These submersible sterilizers are sold under common brand names for allot more money then the generic name brands. I have been using these $26 generic name brand units for about 6 months now phasing out more more expensive and propitiatory "Green Killing Machines" who's replacement bulbs cost $24 and non-watertight circuitry box is susceptible to moisture electric failure. These new submersibles are all-in-one self contained unit, water tight secure using just 1 silicone O-ring with a much stronger motor and larger impeller blade that can be adjusted for flow using an injection air-valve which doubles as an aerator-powerhead. The UV bulb is large and has a clear visible window indicator to let you know it needs replacement. The performance is impressive as the 100 gallon tank which faces a northern window will be free of algae using the UV and then months later when the bulb fails I will notice unusual algae growth before noticing the indicator is no longer lit and that is with using a wall timer set to 12 hours-ON and 12 hrs OFF the bulb last me 6 to 8 months. The replacement bulbs cost $10 shipped from HongKong (best price) and arrive in about 2 weeks well packed and ready to plug back in and operate in 1 minute. NO more inside and outside components with multiple control box/transformer wire connections. This unit is compact all-in-one esy to remove and replace with a very secure 4 suction-cup base that it slides in and out of so there is no fussing with removing suction cups.
Below are who I bought the unit and bulbs from.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=190430943727&ssPageName=STRK:MEWNX:IT
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=170539743090&ssPageName=STRK:MEWNX:IT
Below are who I bought the unit and bulbs from.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=190430943727&ssPageName=STRK:MEWNX:IT

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=170539743090&ssPageName=STRK:MEWNX:IT
