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doesnt the sun aka uv cause algea in tanks? if so, how does it kill it in a canister? lol fish keeping....smh....maggie thecat said:I had,a filter that looked not dissimilar . It was a Sun Sun. It leaked all over the place, no matter how much we tinkered with the O ring.
Chinese manufactured equipment is very hit or miss.
UV sterialization means the water is passed through a chamber that is exposed to ultraviolat light. It can kill many pathogens and other unwanted organisms in the water column like algae.
UV sterialization is a desireable feature.