FWIW you should NEVER count your return as flow in your tank
i do believe that the return counts as flow, granted you have to subtract head loss, but it is still creating movement through the display. that would be equivalent of saying that a closed loop would not be considered as flow in the display, just because the pump is external!!:hammer:
no it wouldnt be the same, (and it has nothing to do with internal or external) with a closed loop as its sole purpose is to create FLOW.....and is properlly sized for such, a return pump is nothing like that...........
....ie, in my tank (a 37gall) i run a mag 7 which is 700 gph, but when you count the 4 feet of head height its more like 280-320 and thats wide open and brand new, with no sludge build up in the plumbing which will slow it down and no detritus in the foam filter on the pump and no calcium build up in the pump itself all of which can and will slow the pump to a trickle.............
......furthermore i really believe that flow to the sump should be somewhere between 5-10 times your TOTAL water volume, in otherwords just use your return as a means to transport water to your sump so the bones of your filtration system can have a chance to work with the dirty water for as long as possible, slow flow sumps give reactors and skimmers more time to do their jobs correctly and also cut down on micro bubbles and salt spray/creep..........
......using my tank as an example i have a mp 40 which is 3000 gph giving me somewhere around 80 times turnover so what is my 300 gph from my return really going to add to that????????................and using your mentality people with hang on skimmers and fuges should count those pumps as flow too?????????
no it wouldnt be the same, (and it has nothing to do with internal or external) with a closed loop as its sole purpose is to create FLOW.....and is properlly sized for such, a return pump is nothing like that...........
....ie, in my tank (a 37gall) i run a mag 7 which is 700 gph, but when you count the 4 feet of head height its more like 280-320 and thats wide open and brand new, with no sludge build up in the plumbing which will slow it down and no detritus in the foam filter on the pump and no calcium build up in the pump itself all of which can and will slow the pump to a trickle.............
......furthermore i really believe that flow to the sump should be somewhere between 5-10 times your TOTAL water volume, in otherwords just use your return as a means to transport water to your sump so the bones of your filtration system can have a chance to work with the dirty water for as long as possible, slow flow sumps give reactors and skimmers more time to do their jobs correctly and also cut down on micro bubbles and salt spray/creep..........
......using my tank as an example i have a mp 40 which is 3000 gph giving me somewhere around 80 times turnover so what is my 300 gph from my return really going to add to that????????................and using your mentality people with hang on skimmers and fuges should count those pumps as flow too?????????