best C02 injection location on DIY reactor? - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 06-08-2005, 08:02 PM Thread Starter
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Question best C02 injection location on DIY reactor?

Okay, I am piecing together the last bits of my DIY inline C02 reactor. As I have read, the area where the C02 is injected into the reactor varies depending on the rate of water flow. As I understand it, you inject C02 at the top of the reactor for higher flow systems, and towards the bottom for low-flow setups. That's all well and good, but what exactly constitutes a "high-flow" or "low-flow" setup? I'll be using an Eheim 2215, followed immediately by the reactor and then a Hydor ETH 200 all on a 30-gallon tank. I'm concerned about the best injection location becayse I'd like to drill once and be done with it, instead of drilling and plugging holes as I experiment with what works best.


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post #2 of 5 (permalink) Old 06-08-2005, 08:55 PM
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If your DIY reactor is like one made from gravel vac, you could do what I did:

Drill a hole off the center of top cap and feed the polycarbonate tube (purchased at Petco) bent slightly at the end so that injection occurs at the center of the reactor tube down the reactor. Seal off with silicone. It should still allow you some movement up and down to adjust injection location.

I use Rio-90 powerhead mounted to inject water into the reactor from the top-side creating a vortex. The injection point is about 2/3 the way from the reactor. I don't remember the gph rate of this powerhead, but you can look it up for better understaing of the flow rate/injection point relationship.
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post #3 of 5 (permalink) Old 06-08-2005, 11:32 PM
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I believe that you inject the c02 right before the pipe enlargement. This minimizes the chance of suction, especially if you are using DIY CO2 yeast mixture.

Jeff B
Algae farmer Extraordinaire
-----------------------------------------------
29gallon - AH Supply 1X55w 5500K, 1X13w Red (Night) CP -- pressurized C02, milwaukee regulator, DIY inline C02 Reactor -- Rena XP1
----------------------------------------
Hygrophila polysperma 'Rosanervig'
Echinodorus Uruguayensis "Amazon Sword"
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post #4 of 5 (permalink) Old 06-09-2005, 12:16 AM
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I followed James Hoftiezer's plans and have my CO2 injected at a right angle to the water inlet. This creates immediate turbulance at the point of injection. One of my reactors is powered by a Mag3 pump and what CO2 that gets discharged from the spraybar is in the form of tiny bubble that dissipate before they reach the surface (my spraybar is located at the bottom of the tank).

My other reactor is powered by a Fluval 304 filter and I've yet to see any CO2 bubbles being discharged from the filter outlet.

—Bill

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post #5 of 5 (permalink) Old 06-09-2005, 02:27 AM
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I think right angles work better, purely becuase of the flow of watter down the sides of the reactor, but either way, it doesn't really matter IMO.

Also fit it at the top, ESPECIALLY if you're running DIY co2, as the pressure head of having it at the bottom makes the bottles have to work harder, you get less c02 dissolution, and a very real possibility of things going foom.


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Like drops of fertiliser into the tank, so are the days of our CO2...
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