Rex grigg reactor problems - The Planted Tank Forum
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post #1 of 21 (permalink) Old 08-14-2013, 01:51 AM Thread Starter
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Rex grigg reactor problems

I made a 2 foot rex grigg reactor using 1 1/4 inch PVC and using a maxi jet 900 to push water through it. I'm getting huge bubbles coming out of the outflow can someone help me?
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post #2 of 21 (permalink) Old 08-14-2013, 01:55 AM
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What do you have inside to break up the bubbles?
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post #3 of 21 (permalink) Old 08-14-2013, 01:59 AM
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You have the flow coming out the bottom? Sometimes you need to invert it to get the large bubbles out of the top. If the gurgling is too loud you may need to burp it too

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post #4 of 21 (permalink) Old 08-14-2013, 02:03 AM Thread Starter
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Yes the outflow is coming from the bottom and I burped it. I shouldn't need anything to break up the bubbles in the reactor according to the instructions by Rex grigg.
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post #5 of 21 (permalink) Old 08-14-2013, 02:23 AM
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Your flow is too high for the pipe diameter. Either decrease the flow or increase the pipe diameter to give it a chance to dissolve.
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post #6 of 21 (permalink) Old 08-14-2013, 02:28 AM Thread Starter
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Would a maxijet 400 work?
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post #7 of 21 (permalink) Old 08-14-2013, 02:38 AM
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I run mine on,the outpit of my filter with good results

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post #8 of 21 (permalink) Old 08-14-2013, 02:46 AM Thread Starter
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They don't sell 5/8 barb fittings at any of the hardware stores only 3/8 so I'm kinda stuck with the powerhead. Even with the maxijet 400 I'm getting a few bubbles.
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post #9 of 21 (permalink) Old 08-14-2013, 02:58 AM
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Run the Maxijet in the powerhead mode. At 110gph, it should not blow bubbles through a 1 1/4 pipe. But yeah, the main thing is tube diameter. 1 3/4" pipe has double the cross sectional area of 1 1/4". The higher the flow input, the higher the cross sectional area in the reactor needs to be to slow it down enough for the bubble to float up. Think about how fast a bubble travels up in water. That's how slow your flow needs to become
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post #10 of 21 (permalink) Old 08-14-2013, 03:07 AM
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I used the half inch barbs with my 2217 they worked fine

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post #11 of 21 (permalink) Old 08-14-2013, 03:18 AM Thread Starter
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I pushed a 3/8 tube into a 5/8 tube put it on the barb fitting and clamped it really good. It's attached to my filter which is rated a 263 gph but its full of media so its probably going about the same as the maxijet 400. I'm getting a few bubbles but that might just be air getting pushed out.
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post #12 of 21 (permalink) Old 08-14-2013, 04:01 AM
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1.25" is too small. I think mine is 4". The more right angles, the less the flow too.


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post #13 of 21 (permalink) Old 08-14-2013, 04:32 AM Thread Starter
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I put a ista max mix after it on the outflow so hopefully that will dissolve the random bubbles left behind. 4 inches in diameter is huge lol
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post #14 of 21 (permalink) Old 08-14-2013, 02:59 PM
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I just checked, it's atually 2.5".

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post #15 of 21 (permalink) Old 08-14-2013, 04:27 PM
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Quote:
Originally Posted by Chronados View Post
Your flow is too high for the pipe diameter. Either decrease the flow or increase the pipe diameter to give it a chance to dissolve.
THIS.

I built a monster 3" pipe, 18" long....

And I get ZERO bubbles, even when my CO2 is CRANKED....
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