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Message: [QUOTE="crsublette, post: 186787, member: 3847"] Fair enough, yet the quite weak UV devices are good enough to have a noticeable kill on floating algae, whether be it 99.999% or 70% or 30%. Due to this anecdotal observation, then I believe a stronger UV, such as the sterilizers mentioned by the aforementioned brands, giving better penetration, would most definitely have an equal impact on other bacteria and organisms. Since now we are talking belief.... What anecdotal observation can YOU provide to suggest, with common conventional filtration found with avid koi hobbyists, that suggests one of the high quality actual UV sterilizers can NOT have a significant impact on the kill rate of organisms mentioned above ??? Showed you mine now show yours... that is applicable in OUR context aquaculture. We are not talking about water treatment plants to create safe drinking water. [/QUOTE]