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Message: [QUOTE="Pondjunky, post: 70351, member: 2281"] so i got my doc 55 gal filter up and running. I got it with 1/2" irrigation tubing and supplied by a 1500gph pump with no restrictions on a 1600 gal pond. From the time I turn the pump on it take 2mins 20 secs to fill the barrel and go out the outflow pipe. I like the flow cause it makes my waterfall look nice but I'm concerned that it might be going to fast through the barrel. Should I add a ball valve and slow the water flow down so it stays in the filter closer to 4-5mins or do you think 2.5mins will be enough? thanks [/QUOTE]