Reply With QuoteOr a gUSH oBubble outlet that channels the outflow towards the surface?
http://www.gcshop-sg.com/product_vie...&stm=-1&dsct=0
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Good day to all.
I am considering getting an Eheim Pro 3 1200XL for use on a current 60x30x40cm tank. The filter has a flow rate of 1700L/Hr. I am considering this model as I may in the near future set up a 4x2x2ft tank and the filter can be effectively re-used for a tank this size.
Will like to seek opinions if the flow rate for my 2' tank will be too much of an overkill. I have plan for the use like VIV spin lily pipe outlet and throttling down the filter output tap to reduce the likely turbulence that will result from the filter's high flow rate.
Thank you for all advice.
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Or a gUSH oBubble outlet that channels the outflow towards the surface?
http://www.gcshop-sg.com/product_vie...&stm=-1&dsct=0
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Good planning. With that outlet, the flow should be significantly reduced.
Hi Hann. Thanks for the reassurance. Which one do you reckon is a better choice? The spin lily pipe or oBubble? Thank you.
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I believe the flow will be increased as you have to step down from a 17mm outlet to 13mm if you are using that Gush outlet pipe. The hose diameter of Pro 3 is 16/22. The Gush pipe in the picture is for 12/16. Can Seniors please confirm?
You can use the adjustable outflow control lever to reduce the flow rate.
i am using Eheim Pro 3 flow rate 900l/hr on a 2feet tank and flowrate is adjusted to half and already seem quite strong. Take note lever at half is not equivalent to 900 divided by 2.
The flow rate will decrease if a narrower lily pipe is used (ie. 16/22 outflow port -> 16/22 to 12/16 converter -> 12/16 lily pipe), it has a similar effect as if the outflow tap is adjusted to reduce the flow.Originally Posted by Et66
Just have to install and see how much flow it reduces and then tune accordingly.
How can flow rate decrease with a narrower outlet? Area X flow rate (speed) = volume. If volume remain constant, area should be bigger to slow down the flow rate. Correct me if I am wrong.The flow rate will decrease if a narrower lily pipe is used (ie. 16/22 outflow port -> 16/22 to 12/16 converter -> 12/16 lily pipe), it has a similar effect as if the outflow tap is adjusted to reduce the flow.
Just have to install and see how much flow it reduces and then tune accordingly.
I thought one should get a 17mm outlet with a bigger mouth.
That's my exact thought too. Reduced pipe diameter = faster flow rate.
My preference is actually the lily spin pipe over the oBubble outlet. However, it seemed to be VIV only has a 13mm diameter version for the lily spin whereas gUSH has 17mm model for the oBubble.
Really need to ponder it through carefully as the 1200XL shouldn't be cheap. Market price is $6XX?
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IMO, nothing much can go wrong with a higher capacity filter, especially Eheim pro 3 series, flow can easily be adjusted with a single lever. I will go for it bro. What if you one day put it through a chiller, in-line co2 diffuser or UV etc.
I have the Pro 3 600 (rated 1250l/hr) for my 75x45x45cm and I regret not getting the 1200XL. After I put mine through a chiller followed by a UV, the outflow fell alot, that much that I had to add a small powerhead into my tank. Therefore for your future 4 feet, the 1200XL is the best option. For the 2 feet now, just put the adjustable flow lever mid-way. Cheers.
I think you are referring to the "flow speed" difference when using a narrow pipe mouth outlet (which is different from the "flow rate" difference when using a narrower outflow pipe), when you see the higher speed of the flow from a pipe with narrow mouth, that is the effect of concentrated flow to one spot, versus a wider area. The volume of water that is moved (aka flow rate) is still regulated by the tap and width of the hoses and pipes that are connected to the canister filter.
A 17mm outlet with wider mouth doesn't reduce "flow rate", instead it reduces "flow speed" by spreading out the current so that the overall water flow is diffused to a wider area to create a gentler water circulation, the volume of water moved/flow rate is still the same, it's just not concentrated into one spot.
Hope that clarifies my explanations.
Last edited by Urban Aquaria; 3rd Jun 2014 at 15:36.
That's great information from all contributors of the thread. Thank you all and I will go for a Pro 3 1200XL.
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Okay. I got your point. Are we more concerned with flow speed or flow rate if we are using a greater Litre/hour canister?
Flow speed as I am preventing the creation of a washing machine in a 2' tank?
For high flow rate canister filters, its usually the flow speed that people are concerned about. The key is to maximize the flow rate used, but still keep flow speed moderated to provide good circulation and yet not uproot plants.
Last edited by Urban Aquaria; 3rd Jun 2014 at 16:44.
So the best option for outlet pipe on an Eheim Pro 3 1200XL will be either a 13mm spin lily pipe or 13mm oBubble pipe? The goal here is good circulation and not uproot plants in the process.
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Then you will have to get converter for 16/22 to 12/16 and 12/16 tubing.
I will just need the convertor as the tank was originally filtered by a 2215 hence already using 12/16 tube.
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I've used both types of outflow designs before and for your 2ft tank, i think it'll probably be better to use the oBubble pipe. Although it slows down the current, the angle and direction of its outflow mouth will do a better job of circulating water forward across and around a 2ft tank.
The narrowing of the output hose from 16/22 to 12/16 in order to use the 13mm pipes would mean it'll already be running at a reduced flow rate anyways, so maybe that could be enough (along with abit of tap adjustment) to moderate the current and circulation in your tank.
Btw, have you considered to use 2 filters for your future 4ft tank, instead of one large filter?
For example, maybe 2 x Eheim Pro 3 350... or 2 x Eheim 2217. They may not have the massive filtration volume of a single 1200XL (25 liters filter volume is awesome though, comes fitted with wheels to move it around during filter maintenance), but with 2 filters you can have more flexibility to position each of them to create better circulation around the tank.
With 2 filters, it could also save the eventual need to get a wave maker to cover deadspots in the 4ft tank and you'll have an easier time regulating the flow with a more moderate flow rate filter for the existing 2ft tank too.
Just a suggestion though, ultimately either method will work and have their advantages.
Last edited by Urban Aquaria; 3rd Jun 2014 at 21:54.
I am learning towards the 1200XL as there's a fair possibility that I will install a chiller in tandem with this filter. Do not want the flow to slow down after passing through the chiller. I also have a pair of 2215 which probably will be utilized in the 4' tank as for additonal flow around all spots of the tank and to alternate between each maintenance.
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