The Rex Reactor - Page 11 - The Planted Tank Forum
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post #151 of 225 (permalink) Old 12-03-2008, 03:11 AM
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I should maybe add that mine is mounted as shown in the pic, the T fitting is near the bottom. I used that as the input for the CO2 so the bubbles are rising from the bottom against the flow of the water which goes straight in the top and out the bottom.

80 gal planted thread: http://www.plantedtank.net/forums/ph...tons-pics.html

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post #152 of 225 (permalink) Old 12-03-2008, 04:12 AM
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Typically you would want to inject CO2 at the top of the reactor close to where water enters, the standard design for the reactor.

I've tried it both ways and injecting at the bottom provided significantly more undissolved bubbles at the outflow.

I know somewhere in this thread someone did all sorts of fancy math to show how bubbles rise and dissolve and all that, but the math and the overwhelming amount of anecdotal evidence didn't jive. Anecdotally the bubbles dissolve as they are forced down the reactor from water pressure/current, not as they rise through the water column.

75 Gallon Planted Tank Journal, Details | 5.5 Gallon Reef
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post #153 of 225 (permalink) Old 12-03-2008, 05:11 AM
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Doh! I stand corrected! I had this conversation with someone already and I ended up with the injection point being at the top not the bottom. So... I'm actually running it like you just mentioned, it's mounted upside down from the picture I posted earlier... please disregard that last post. (I'm on nightshift and must not have had a coffee yet!)

80 gal planted thread: http://www.plantedtank.net/forums/ph...tons-pics.html

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post #154 of 225 (permalink) Old 12-03-2008, 05:17 AM
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Here's my 8 year old version

I built this from scratch many years ago. It's still running on my 55g Discus tank.

DIY CO2 Reactor

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75g - Planted Tank
Clown Loaches, Harlequin Rasboras, Rummy Nose Tetras, Corys, & Skunk Botias.
Eheim 2026 w/ surface skimmer and Hydor 300W inline heater, & 2217 w/ prefilter intake.
Pressurized CO2 w/ DIY inline reactor, Home-made Drop Checker.
220W PC lighting, EI fert dosing.
All controlled w/ Aquacontroller Jr.

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post #155 of 225 (permalink) Old 12-03-2008, 05:19 AM
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Heh, alright. You'll have to let us know how your bit of injection hardware works out. I had a hose barb and injected through that, but then switched over to pulling the tubing through a hole as Rex recommends. I want to say the ordinary tubing without the barb worked better, but I think they're basically on par with each other.

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post #156 of 225 (permalink) Old 12-03-2008, 05:26 AM
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Well so far, so good. I get very minimal tiny bubbles in the tank at 3 BPS. Almost completely broken down by the reactor. I mean very minimal bubbles escape. Maybe one or two every so often. Does it have anything to do with the injection method? I don't know as I have not tried it the other way. But this does seem to be working well, so why mess with it?

80 gal planted thread: http://www.plantedtank.net/forums/ph...tons-pics.html

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post #157 of 225 (permalink) Old 10-11-2009, 10:23 PM
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post #158 of 225 (permalink) Old 01-29-2010, 10:21 PM
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the pipe comes in 24" piece is that to long or should i cut it down?
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post #159 of 225 (permalink) Old 09-24-2010, 08:38 PM
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so after reading this whole thread my only question is, do any of you know the standard hose size for an xp3? i believe it's 5/8 but i would like to make sure before i go buy the parts. also, i have an inline heater and was wondering if anyone else has such a setup and has recommendations as to whether to put it before or after the reactor. for those with an xp3 and a reactor, are there any priming issues? or more noise? thanks for your help
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post #160 of 225 (permalink) Old 09-24-2010, 11:12 PM
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Yes, the filstar is 5/8". I couldn't find barbs locally, got mine at savko.com.

Can't help with the heater, sorry.
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post #161 of 225 (permalink) Old 09-24-2010, 11:20 PM
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I used 3/4" barbs and a cup of hot water. Only way to get them off is cut the hose. I found 5/8" at Ace but for some reason even with teflon tape the fitting would bottom out before it was tight.

As far as priming, that's all done on the intake side of the filter. So the filter will prime OK but it takes a while to evacuate all the air from the reactor.
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post #162 of 225 (permalink) Old 09-24-2010, 11:24 PM
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Yeah, it's amazing what I've accomplished with scolding hot tap water.
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post #163 of 225 (permalink) Old 09-24-2010, 11:51 PM
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The Rex Reactor

I am putting one of these together to run inline with my canister. Does it matter if I place it before or after the filter.
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post #164 of 225 (permalink) Old 09-25-2010, 12:34 AM
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It needs to go on the output side Ocelli
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post #165 of 225 (permalink) Old 10-30-2010, 07:25 PM
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Would putting a 90 degree elbow in the middle of this reactor affect performance? The layout of my cabinets would involve lots of extra plumbing but if I put a 90 elbow in the middle it would fit very well...
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