In my Opinion,there are much better uv sterilizers available than the turbotwist-I believe the 2 best manufacturers are the Pentair Emperor series and Aqua UV- both are companies that specialize in uv and water treatment,especially Pentair
http://pentairaes.com/?gclid=Cj0KEQi...CswaAveQ8P8HAQ
Both made in USA and have long successful track records of producing great products with parts/support available for models long after they are out of production.There is a site having a sale currently on the Emperor products {I have bought from them before,they are reputable} see here
http://www.aquariumplants.com/Search...show=24&page=1
Good luck with whatever product you end up with!