Just a heads up, anyone that purchases a Hydrologic filtration system of any kind, when removing the cartridges it's righty loosey lefty tighty ..strange to me but I fucked up the plastic wrench tool trying to unscrew them righty tighty lefty loosey..The tool still works though so all good..After I was done filling the barrel last night I wanted to put the filter back the way it came in the box, so I wanted to empty the water in it..Very simple setup though..Had the whole thing working in minutes..Comes with a nice little shutoff valve which I liked..I ran the water very slow in the beginning to fill both filter compartments,then once filled turned the hose up.After this, for about 5 minutes, I ran the output line into a separate 5 gallon bucket to purge the system of any loose carbon which did spit out black water at first..That's it though, once that was done it didn't even take 30 mins to fill a 50 gallon barrel..( Wasn't keeping track of time, so not exact but it didn't take long at all )