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Old 01-12-2012, 12:11 AM   #1
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Flow Directions with cannister filters

I have two Rena xp3 on my F.W. 120 gallon and need to reduce the flow because the current is going to be to strong for my future angelfish.

I have a question on how should I position the outlets? Right now I have one horizontal spraybar and inlet on both ends of the tanks. Right now one spray bars points up and one points down to make a couterclockwise flow pattern.

I have been thinking about drilling the holes larger on the spray bars and/or drilling additional holes so that there is about a 70 degree angle between the holes. The plus side, I would be able to get some surface agitation and some flow along the bottom... However. would that be a bad idea since the flow would meet in the middle of the tank from both sides and pretty much create a dead zone??

Pictures below of current and what I want to do.

I am limited at re-positioning inlets and outlets because of tube lengths and my ability to remove them without breaking hardware.

I am also going to add a sponge filters on both inlets.
Red circles are spray bars pointed east west


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Old 01-13-2012, 02:54 AM   #2
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if you're worried about too much flow just use the inline valves that attach to the pumps outflow

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Old 01-13-2012, 03:06 AM   #3
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Yea, I thought about that, but I still wanted to get the most out of the filters. I went ahead and drilled holes and it did slow the velocity down quite a bit. Now I'm going to see how food and wastes travel throughout the tank.
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cannister, filter, filters, flow

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