Which powerhead to use for a CO2 reactor - The Planted Tank Forum
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post #1 of 7 (permalink) Old 06-04-2003, 01:55 PM Thread Starter
Algae Grower
Join Date: May 2003
Location: British Columbia, Canada
Posts: 17
Hi guys, I'm a newbie here and I have a question? :? I want to make a CO2 reactor for a 10 gallon tank using the method posted at http://www.plantedtank.net/co2reactor.html but I am concerned about using the RIO 600 or an equivalent powerhead because of the 200 GPH specs. Would this be overkill for such a tank. I know they suggest the water should circulate 5-6 times the size of your tank, so for my 10 gallon tank I should need a minimum of 50 GPH. My current CO2 level is 3-4 ppm based on the pH KH chart at Chucks planted Aqurium page.

What size powerhead would you recommend. TIA

10 Gallon Tank
pH 7.6
KH 80ppm, 4.5dKH
UGF using airstones
java ferns and wisteria
2 guppies
2 baby guppies
1 Pleco
1 Kuhli Loach
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post #2 of 7 (permalink) Old 06-04-2003, 03:13 PM
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Location: Minneapolis, MN
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If you use the output of the powerhead to shoot water into your reactor, you should have no problem. If you are using the intake of the powerhead to pull the water through the reactor, it may get a bit turbulent.
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post #3 of 7 (permalink) Old 06-05-2003, 01:43 PM Thread Starter
Algae Grower
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Location: British Columbia, Canada
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post #4 of 7 (permalink) Old 06-08-2003, 11:44 PM
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I want to try the same thing. But I do believe that the Rio 600 would totally rip my 10g apart. I am thinking of using the Rio 50(69gph) or 90(85gph).

The way I would have to position reactor is horizontal since it is too long to place vertical. I am hoping this will not make a big difference.
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post #5 of 7 (permalink) Old 06-09-2003, 06:21 AM
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It will probably cause problems unless you come up with an inventive solution. The main idea behind a reactor is to have the water run counter-current to the CO2. In other words you want the water to flow down while the CO@ bubbles try to float up. That was you get the most dwell time and the bubbles are exposed to the maximum amount of water. Another benefit to the powerhead/gravel vac reactor is that if the CO2 makes it to the top the impeller of the powerhead breaks it up into a fine mist. With the tube situated horizontally the bubbles will just shoot out the end with less time to dissolve. If you do it that way you may as well inject the bubbles at the inlet of the powerhead and do away with the gravel vac tube.

Just my $.02

Disclaimer: Any errors in spelling, tact, or fact are transmission errors.
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post #6 of 7 (permalink) Old 06-10-2003, 01:06 AM
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Thank you for the explanation. I may have to rethink on how I should place this in the tank. But I shall try horizontal first for the sake of simplicity and ease. A diagonal position may be the second best unless I go for a smaller tube that fits vertical.

Next week when I get the rest of the supplies I will see how it turns out.
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post #7 of 7 (permalink) Old 06-11-2003, 02:42 PM Thread Starter
Algae Grower
Join Date: May 2003
Location: British Columbia, Canada
Posts: 17
Hi guys I got the reactor up and running last night and I'm happy to say it appears to be working great. The RIO 600 when attached to the reactor doesn't even mildly stir up the gravel. One problem I did have though was when I first place the pump in the tank I get vapor lock unless I remember to tilt it to remove any air. Thanks for your help.

10 Gallon Tank, 28 watt CF,DIY CO2, pH 6.8
KH 80ppm, 4.5dKH
java ferns, wisteria, dwarf saggitaria,Water Primrose
too many guppies to count,1 Kuhli Loach, 2 oto's
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