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domjd05
06-06-2010, 05:47 PM
Hey so some of you know I set up a pressurized co2 kit on my tank. Working great so far, seeing some results, but, the diffuser is a cheap glass one that came with the kit, and there's tons of bubbles still just going to the surface... looks like wasted co2 to me..

So today after my WC, I started to play around, I disconnected the diffuser and put the end of the co2 hose right next to the pump in my sump.

Sure enough, the pump sucked the bubbles right up, and it seems to have done a good job, because NO bubbles were coming out the return, all I'd had to do is angle the return down just a few degrees and it'd be perfect... right?

Now comes the tricky part... I've heard that injecting the co2 right into the impeller or something like a sump pump will eventually hurt the pump.. Is this true? the co2 is running at a little over 1bps.. the pump makes no noise and theres no co2 buildup causing burps or anything like that..

Edit: the only noise you can hear is the instant the bubble hits the impeller, but its very minute, and not noticable.

rich311k
06-06-2010, 06:52 PM
I have heard that as well. I pipe mine into my cannisters and have had no troubles with airlocks or my impellors failing. I have done this for years. The carbolic acid concentration is just not that high.

domjd05
06-06-2010, 07:00 PM
Thanks! I figured as much, I just wanted to post to see if anyone had any horror stories relating to the subject..

Now I don't know if it's worth changing it over, I'm seeing results now, even though it seems most of the bubbles are escaping through the surface..

WhiteDevil
06-06-2010, 09:14 PM
It can/will cause the impeller to wear down prematurely due to pumping the air bubbles directly.
I diffuse my pressurized with a rio pump equipped reactor and my DIY I use a marineland 660 powerhead which chops the bubbles up really fine and not many make it to the surface.
This is the reactor I use
http://www.aquariumplants.com/AquariumPlants_com_s_Own_External_Reactor_p/ext5000.htm

ILuvMyGoldBarb
06-06-2010, 09:29 PM
I personally used a Rex Grigg style reactor with my canister returns. It would also work with a sump return, many use it that way. Total cost is less than $20 to build.

domjd05
06-06-2010, 10:44 PM
I personally used a Rex Grigg style reactor with my canister returns. It would also work with a sump return, many use it that way. Total cost is less than $20 to build.


How much does it effect the flowrate?

ILuvMyGoldBarb
06-06-2010, 10:45 PM
nominal effect.

domjd05
06-07-2010, 12:34 AM
Rex's site seems to be down right now..

But I do remember his design.. the 90 degree elbow is the bottom of the reactor, right? I guess considered the "input"? And obviously the other end is the top..?

Where do you put the co2 line in? towards the top?