"Head loss" in ZooMed and Tom Rapids filters? - The Planted Tank Forum
 
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post #1 of 11 (permalink) Old 12-30-2008, 01:48 AM Thread Starter
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"Head loss" in ZooMed and Tom Rapids filters?

I'm trying to decide on a canister filter for a 6 gallon tank- I know, join the club. I am of course looking at the Tom Rapids and Zoomed filters, and also the Eheim 2213 but I'm worried about excessive flow for a shrimp-only tank.

I plan to place the filter in the stand about 24" below the tank because I do not like to see equipment, but I keep reading posts on Zoomed and Rapids filters that the pumps are "not powerful enough to overcome the head loss" to be placed below the tank.

I don't understand this. I always thought in a closed loop system like a canister filter there essentially is no head loss since the pressure needed to pump the water up the return is countered by the pressure flowing down the intake.

I used to have a small DIY canister that used a crappy fountain pump and I was able to get OK flow with the filter located 3ft below the tank.

Am I missing something?

James
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post #2 of 11 (permalink) Old 12-30-2008, 01:52 AM
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you can always cut the flow down on the Eheim, idk about the others. a 2213 is perfect for a 6 gallon
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post #3 of 11 (permalink) Old 12-30-2008, 01:58 AM
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I'd just get the Eheim 2213. You can reduce the flow by partially closing the quick disconnect on the outtake side only (doing it on the intake side burns out the motor, or so I've read)

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post #4 of 11 (permalink) Old 12-30-2008, 02:16 AM
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I've got an Eheim 2213 on my Mini M (approx 5.15g) I have it throttled back about 1/3. as the filter seasons itself I should be able to turn it up again.

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post #5 of 11 (permalink) Old 12-30-2008, 02:19 AM
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If you plan on putting the filter in the stand than go with the Eheim. You can cut the flow down with the ball valves with no ill effect. There is also the Hydor canister filter Prime 10 I think. Small unit that could go under the tank and less expensive than the Eheim.

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post #6 of 11 (permalink) Old 12-30-2008, 02:30 AM
 
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Question

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Originally Posted by ZooTycoonMaster View Post
I'd just get the Eheim 2213. You can reduce the flow by partially closing the quick disconnect on the outtake side only (doing it on the intake side burns out the motor, or so I've read)
Eheim 2213 or 2232 cannister filter??? I always thought that the Eheim 2232 was the one recommended for 5+ gallons.
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post #7 of 11 (permalink) Old 12-30-2008, 02:31 AM
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Eheim 2213 or 2232 cannister filter. I always thought that the Eheim 2232 was the one recommended for 5+ gallons.

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post #8 of 11 (permalink) Old 12-30-2008, 02:35 AM
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I would go for the Eheim. I have a Tom Rapids Mini Canister and am not overly impressed with it.


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post #9 of 11 (permalink) Old 12-30-2008, 02:39 AM
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Originally Posted by lotekfish View Post
I'm trying to decide on a canister filter for a 6 gallon tank- I know, join the club. I am of course looking at the Tom Rapids and Zoomed filters, and also the Eheim 2213 but I'm worried about excessive flow for a shrimp-only tank.

I plan to place the filter in the stand about 24" below the tank because I do not like to see equipment, but I keep reading posts on Zoomed and Rapids filters that the pumps are "not powerful enough to overcome the head loss" to be placed below the tank.

I don't understand this. I always thought in a closed loop system like a canister filter there essentially is no head loss since the pressure needed to pump the water up the return is countered by the pressure flowing down the intake.

I used to have a small DIY canister that used a crappy fountain pump and I was able to get OK flow with the filter located 3ft below the tank.

Am I missing something?

James
You are partially correct. The static head is countered and is hydrostatically balanced in a closed loop. The problem is the physcal pressure on the impeller itself and its inability to drive under the seated pressure. It may still work, just not well and could cavitate eventually.

There are also additional minor loses for the tubing of course.


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post #10 of 11 (permalink) Old 12-30-2008, 02:45 AM
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If you try to run the Rapids Pro canister 24" below the tank it probably will not work at all. I say probably because I have never tried it. Maybe this weekend I can hook the other one I have up to the ten gallon tank that has a 24" tall stand an see if it pumps.

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post #11 of 11 (permalink) Old 12-30-2008, 11:41 AM Thread Starter
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Thanks for all of the feedback, you've convinced me to go with the Eheim 2213. You pimps earn your money!

I was reluctant to spend the $$ at first because I don't know if this nano is a long term tank or a short term experiment, but then I remembered that if I buy a good filter I'll always be able to sell it.

Anyone have a used one for sale?
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