Simpler DIY PVC CO2 reactor..... - The Planted Tank Forum
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post #1 of 92 (permalink) Old 08-09-2007, 02:41 AM Thread Starter
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Simpler DIY PVC CO2 reactor.....

http://rexgrigg.com/diy-reactor.htm


Only 5 pieces of PVC, two hose barbs and one piece of tubing.

Just for educational purposes. I highly doubt the thing will work. I have no proof I can grow plants. So suspect anything that I build.
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post #2 of 92 (permalink) Old 08-09-2007, 12:53 PM
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Hi Rex, welcome back.

Sean

Aquascape? I'm a crypt farmer.

It's a fine line between fishing and standing on the shore looking like an idiot.

That IS an aquascape, it's titled "The Vacant Lot".
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post #3 of 92 (permalink) Old 08-09-2007, 01:25 PM
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Looks fine to me.


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post #4 of 92 (permalink) Old 08-16-2007, 11:02 AM
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Hi Rex,

I was wandering if this reactor can be installed in the return line of the canister? So that the co2 does not pass through the filter.

Brian

Equipment: 55g, 3x 9watt tt uv, 2-xp3's, pressurized co2, inline co2 reactor, 216 watt catalina t5 fixture, milwaukee ph controller, 300 watt hydor inline heater, aqua soil
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post #5 of 92 (permalink) Old 08-16-2007, 11:20 AM
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Depends on your filter, but thats usually the reccomended way by most people.


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post #6 of 92 (permalink) Old 08-16-2007, 12:48 PM Thread Starter
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I always recommend that the reactor be installed on the return line. But what do I know?
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post #7 of 92 (permalink) Old 08-16-2007, 08:38 PM
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Quote:
Originally Posted by Rex Grigg View Post
I always recommend that the reactor be installed on the return line. But what do I know?
Ok great, I want to make one of your reactors to get the glass diffuser out of my tank but did not want to take a chance on harming my filter by putting co2 through it.

Also, you say there is no need for bio balls in this reactor?

Thanks Rex,

Brian

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Equipment: 55g, 3x 9watt tt uv, 2-xp3's, pressurized co2, inline co2 reactor, 216 watt catalina t5 fixture, milwaukee ph controller, 300 watt hydor inline heater, aqua soil
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Last edited by PRESTON4479; 08-16-2007 at 11:46 PM.
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post #8 of 92 (permalink) Old 08-16-2007, 11:57 PM
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Ok Rex I need your opinion.

I went to Lowes today and was unable to find the exact same stuff that you used for your reactor. Although I think I got what I need and I dry fitted everything together. I posted a pic of it all together below. It is made from 2" pvc and uses brass fittings instead of plastic ones. Also instead of drilling a hole for the co2 hose I used an 1/8" hose barb fitting. Overall length of the reactor is 26".

So I have three questions

1. Will this reactor in your opinion serve its purpose?
2. All put together this thing is rather large. Would I be able to shorten it any without affecting its performance?
3. Will the 1/8" hose barb fitting work ok? Instead of drilling the reactor.

Thanks---Brian
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Brian

Equipment: 55g, 3x 9watt tt uv, 2-xp3's, pressurized co2, inline co2 reactor, 216 watt catalina t5 fixture, milwaukee ph controller, 300 watt hydor inline heater, aqua soil
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post #9 of 92 (permalink) Old 08-17-2007, 01:29 AM
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Brass is not good. Especially in a tank with fish. Go plastic.

Rena Filtstar #137!
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post #10 of 92 (permalink) Old 08-17-2007, 01:34 AM
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Quote:
Originally Posted by tropicalfish View Post
Brass is not good. Especially in a tank with fish. Go plastic.
What kind of problems does brass cause? Just curious. Alot of water systems in homes today use brass fittings like ball valves and we fill our aquariums with this water and also drink it.

DiabloCanine used brass on his reactor. Check it out.

https://www.plantedtank.net/forums/di...2-reactor.html

Brian

Equipment: 55g, 3x 9watt tt uv, 2-xp3's, pressurized co2, inline co2 reactor, 216 watt catalina t5 fixture, milwaukee ph controller, 300 watt hydor inline heater, aqua soil
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post #11 of 92 (permalink) Old 08-17-2007, 01:09 PM Thread Starter
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If the reactor is designed properly there is no need to have bio balls in it.

Preston:
1. Maybe
2. Maybe. How much water are you pushing through it?
3. Maybe. The advantage of drilling the reactor is that you get the CO2 injected into the column of moving water (the tubing ends in the middle of the reactor body). With a fitting the CO2 is injected into the edge of the water column which moves much slower.

Brass can leach copper. I have tons of plastic fittings in the correct size.
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post #12 of 92 (permalink) Old 08-17-2007, 02:15 PM
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Lowes has the plastic fittings. And getting the line into the body of the flow through the reactor as Rex mentioned (ie. not just injecting it on the side) is better. I have also seen people using an airstone to breakdown the bubbles more, but I don't see the advantage of that overtime since the airstone is bound to gum up. Shortening the reactor is possible. Testing it out is the only real way to know though.


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post #13 of 92 (permalink) Old 08-17-2007, 04:15 PM
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Brass is an alloy of Copper and Zinc. I guess it could slowly seep into the water...
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post #14 of 92 (permalink) Old 08-17-2007, 08:02 PM
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Rex, add instead of bioballs, the plastic tabs from 6 packs of beer.
Or that bunny grass for easter baskets if you are that type
Or lava rock.
Virtually anything that will not rot.

Regards,
Tom Barr




Regards,
Tom Barr
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post #15 of 92 (permalink) Old 08-17-2007, 09:49 PM Thread Starter
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The first few reactors I build had bio balls in them. And over time they would clog up and slow the flow. So I removed them. Never had a problem dissolving the CO2 without them.

For a Rena XP-3 filter you can go as short as 18" over all length and still have a decent chance of dissolving all the CO2. It just depends on how much you are injecting.
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