3900gph, what size holes for wall inlet

  • We are currently upgrading MFK. thanks! -neo

ITHURTZ

Piranha
MFK Member
Apr 11, 2007
1,846
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81
Antioch IL
Basically this will be the next tank I am building, could be in a month could be in 3. tank itself 8'Lx3'Dx30"T. Total length 9'


The filter will be built onto the side of the tank measuring 3'Dx1'Wx 30"T with a 1' drop below the tank for the pump. (so 42"T)

Now the question is I see these 3900gph waterfall pumps
http://cgi.ebay.com/Pond-Pump-Cal-MAG-DRIVE-3900-gph-Waterfall-pump-Save_W0QQitemZ250427084567QQcmdZViewItemQQptZOutdoor_Decor?hash=item3a4e9e0f17&_trksid=p3286.c0.m14&_trkparms=72%3A1205|66%3A2|65%3A12|39%3A1|240%3A1318|301%3A1|293%3A1|294%3A50

So the main question would be, how big and how many "holes" would I have to put into the wall to keep up with 3900gph. Id love to make a grate I just dont have the "knowledge" so seal the grate from the wood to bypass the wood (pond liner tank). I Would like to place the holes about mid tank or a tad lower so a 50% water change can be done without shutting down the power.

Holes in the side to drain into filter area
tank1.jpg


Pump and filter location, floss on top, bio media then the pump on the bottom sucking everything through the top, discharge would just end up into the main take via threaded bulkheads.
tank2.jpg



Im gonna guess 3 2" bulkheads?
 
This should provide some input here;
http://www.monsterfishkeepers.com/forums/showthread.php?t=205645

Looks like gravitational flow of 2" PVC is about 2400 gph. From this info and considering head loss of the pump would put you at about 2800gph. I would suggest 3x2" overflows. If you had two, you would not be able to support the pump if one of the drains clogged.
 
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