UV Sterilizer ----UV Clarifier whats the diffrence

Im looking to add a UV Sterilizer to my 125 gallon tank.I hace a friend that has a UV1 clarifier that is reted for a 1800 gallon pond that he is willing to give to my for free will this work or do I need something that will work better for my application? 125 GAL FOWLR.Thank you for any suggestions.
 
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