Mag1800 and 1 inch output?

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davenmandy

Peacock Bass
MFK Member
Feb 1, 2012
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I have a mag 1800, i rigged it so I have an adapter so I can use 1 inch pipe for the output. The pump comes with a 3/4 inch male adapter. Got me thinking, is it meant to run 3/4 inch output tubing? Is making it run 1 inch enhancing or deterring the gph output and filtration? Thanks.

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bassguy

bassguy

Plecostomus
MFK Member
Dec 10, 2010
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davenmandy said:
I have a mag 1800, i rigged it so I have an adapter so I can use 1 inch pipe for the output. The pump comes with a 3/4 inch male adapter. Got me thinking, is it meant to run 3/4 inch output tubing? Is making it run 1 inch enhancing or deterring the gph output and filtration? Thanks.

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Click to expand...
Depends on the amount of head, bigger pipe with higher head will increase head pressure lowering gph. More water in the pipes= more head pressure. If it's short runs it can reduce pressure increasing gph. With 3/4 to 1" your not going to notice much either way.


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davenmandy

Peacock Bass
MFK Member
Feb 1, 2012
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Okay. It's at 6 feet of head right now. In the new house sump will be one level under, was going to build a 4 foot stand but now debating 6 foot tall. But i think we're looking at a 10-12 foot head at the new place. I will be running two of those mag 1800s, one with a long head then another because it will be to the side of the tank too. Do I need to upgrade pumps?


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davenmandy

Peacock Bass
MFK Member
Feb 1, 2012
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Just found an online copy of their instructions. It says a size of 1.5" must be used for maximum output... why start it at 3/4" then? more efficient to reduce rather than enlarge, maybe I'm wrong on that. 1.5 seems huge tbh, with an 8 foot head the chart indicated 1050 gph. I will probably have closer to 10 feet, wonder how that will effect the gph when considering the 1.5" tubing? Looks like I really should build a really tall stand and try to keep the sump closer to the ceiling, will such for maintenance though.

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D

davenmandy

Peacock Bass
MFK Member
Feb 1, 2012
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Adapted to fit 1.5 inch tubing based on recommendation of the pump directions. Hopefully with the loss of gph output it will make a difference, just don't get why it wouldn't have a 1.5" output to begin with, easier to reduce it. would adding a powerhead offset the loss of gph from output pumps you think??

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fishguy306

fishguy306

Peacock Bass
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Oct 24, 2005
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You want to use a 1.5" pipe, bassguy actually has it backwards. 3/4" and 1" pvc will reduce the gph, 1.5" will maximize your gph for the pump. Many, many people use piping that is much too small for their pumps. The reason a larger pipe is better is due to friction. A large pipe has a much larger capacity, for example a 2" pipe can handle quite a bit more than double the flow of a 1" pipe. I dont know the exact numbers off the top of my head but it is a huge margin.

In any case, 1.5" does seem huge, that is a big pipe. On my 93 gal I'm in the process of setting up my pump also calls for a 1.5" pipe. I did downsize to 1". Little less flow but a bit more manageable and easier to hide everything.

As to why they include a 3/4" adapter, I dont have a clue. Seems kind of silly to me.
 
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