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Message: [QUOTE="Faultless, post: 144702, member: 5176"] I have one more question about these large UV Filters. The max GPH is really low : for example a UV filter for a 3k gallon pond has a max GPH of 985? If I were to purchase one and incorporate it into this filter project and my pump did 4200 GPH, A UV filter that work with 4200 GPH is meant for a 8k gallon pond. So I guess the question is if I added one to this filter system with a 4200GPH pump would I use the smaller or the bigger one? Or is 4200 GPH way to much for this project? On a side note I'm not completely sold on UV filters, when making my first reef tank I was told by many people "you have to incorporate a UV filter into your system". I've never purchased or installed one because I've never had a algae problem. [/QUOTE]