uv sterilizer

[amethyst212]

what are these good for?

 

[drunktank]

same use for human water. UV light kills certain algaes and bacteria floating in water. Will make ur water much more clearer. Is said to control ick, but theres no actual proof, most likely just eliminates free floating paracites.

 

[Deanos]

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[Chiefmcfuz]

Some people use them on QT and Hospital tanks.