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Thread: best co2 injection methods for a tank with overflow and wetdry Reply to Thread
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  Topic Review (Newest First)
12-06-2012 05:50 PM
plantbrain A Rio 180 should be able to handle it.
12-06-2012 04:14 PM
IWANNAGOFAST alright, so. it didn't work. The flow isn't high enough to chop up the bubbles and keep the purigen in the reactor. I went back to my first method of running an atomic inline diffuser, but I added 4 more feet of tubing before it reaches the reactor. Diffusion rate is much much higher now.
12-05-2012 08:04 PM
IWANNAGOFAST I think I actually have the 100, so it's a little stronger. Problem is I have to turn the flow down when it reaches the reactor so that it doesn't blow the purigen out of the reactor.

We'll see, if it doesn't work then maybe I'll run a closed loop or something.
12-05-2012 07:41 PM
HD Blazingwolf u'll want the impeller to do as much chopping as possible, i believe on a 69 gph model, its gonna make lots of noise and not do a very good job of chopping unless u have a 1-3 bps rate
12-05-2012 07:05 PM
IWANNAGOFAST I'm going to be running the needle wheel on my reactor pump, but due to limited size in the stand, I won't be able to have much more tubing than the 1 foot that's already there.

my question is this, where exactly do I put the co2 tubing? Do I stick it into the intake side or do I add it to the little thing that sticks up the top? I've drawn up a picture to help explain what I'm talking about. I'm using a rio+ 50 btw
http://www.amazon.com/Rio-Plus-50-Aq.../dp/B0027J67GS

12-05-2012 07:05 PM
HD Blazingwolf
Quote:
Originally Posted by plantbrain View Post
Cutting and fraying the impeller works, but the NW specific impellers are the best way to go really.

You can also minimize the orifice for the CO2 tubing coming into the NW pump also, this will produce smaller bubbles. This works at lower rates of CO2, but at higher rates, the hole breaks and the bubbles stay larger.

The other thing you can do is add say 2-4ft worth of tubing between the NW and the reactor chamber.

I use a separate NW pump and do not use the Return pump as the NW. I also just recirculate the water in the sump from the NW near the Return pump so I end up with about 4-8 ft worth of travel. I also use a large UV in some cases as a chamber. Some folks use an empty canister filter.

The smaller clean water filter housing work very well, no modification is really needed other than a PCV pipe inside to pull water from the very bottom if you use the NW approach. Want to count the bubble rate? Turn the NW off for a second.

The issue with crippling your return pump is this: when you modify those impellers, sometimes they get unbalanced and lock/seize up.
What is ur preffered needle wheel?
12-05-2012 07:01 PM
plantbrain Cutting and fraying the impeller works, but the NW specific impellers are the best way to go really.

You can also minimize the orifice for the CO2 tubing coming into the NW pump also, this will produce smaller bubbles. This works at lower rates of CO2, but at higher rates, the hole breaks and the bubbles stay larger.

The other thing you can do is add say 2-4ft worth of tubing between the NW and the reactor chamber.

I use a separate NW pump and do not use the Return pump as the NW. I also just recirculate the water in the sump from the NW near the Return pump so I end up with about 4-8 ft worth of travel. I also use a large UV in some cases as a chamber. Some folks use an empty canister filter.

The smaller clean water filter housing work very well, no modification is really needed other than a PCV pipe inside to pull water from the very bottom if you use the NW approach. Want to count the bubble rate? Turn the NW off for a second.

The issue with crippling your return pump is this: when you modify those impellers, sometimes they get unbalanced and lock/seize up.
12-05-2012 06:36 PM
IWANNAGOFAST after reading through the post on BarrReport, I think I'll be trying the needle wheel method. Although I don't want to buy ANOTHER pump. Thinking about clipping the impeller and maybe glue some mesh to cut outs to make a makeshift needle wheel impeller.
12-05-2012 06:26 PM
IWANNAGOFAST My plants are growing great and no algae. Guess my current injection method is working fine. Might try to run the needle wheel into the reactor but I'll save that for a later upgrade
12-05-2012 04:53 PM
plantbrain
Quote:
Originally Posted by SMB View Post
With so much water agitation over the bio-balls/medium doesn't the C02 get "off-gassed"
more rapidly? Do W->D filters inherently require more C02?
No.

Several aquarist myself included verified this independently via pH change.

You need to seal the dry section*(eg tape etc to block the vents), and minimize the spill over in the prefilter. Use lids on the prefilter etc.

Otherwise, it's not different than a tank's surface.
12-05-2012 01:22 PM
HD Blazingwolf
Quote:
Originally Posted by oldpunk78 View Post
Not enough to seriously alter the cost of co2. What it does do however is get a lot more o2 into the water column. The o2 there is, the more co2 can be added without harming your livestock. Or something to that extent. I didn't word that very well.
u did perfect.. its a simple theory and its true

more o2, = safer co2 injection at higher levels
12-05-2012 12:09 PM
oldpunk78
Quote:
Originally Posted by SMB View Post
With so much water agitation over the bio-balls/medium doesn't the C02 get "off-gassed"
more rapidly? Do W->D filters inherently require more C02?
Not enough to seriously alter the cost of co2. What it does do however is get a lot more o2 into the water column. The o2 there is, the more co2 can be added without harming your livestock. Or something to that extent. I didn't word that very well.
12-05-2012 11:31 AM
HD Blazingwolf
Quote:
Originally Posted by SMB View Post
With so much water agitation over the bio-balls/medium doesn't the C02 get "off-gassed"
more rapidly? Do W->D filters inherently require more C02?
Yes the inherently use more co2

His reactor is not part of the wet dry system so having agitation in there does not decrease co2 levels. He just has bio balls in his reactor
12-05-2012 04:16 AM
SMB With so much water agitation over the bio-balls/medium doesn't the C02 get "off-gassed"
more rapidly? Do W->D filters inherently require more C02?
12-05-2012 03:03 AM
ftwchopper I tee off the return line from the pump and back to the sump to a medium sized gravel vac.Half inch ball valve inline to control flow.I then place the co2 line in/under the vac tube.This creates a down flow of water and an up flow of co2 mixing in the gravel vac...no loss of co2...works good.Oh and the gravel vac tube is filled with bio balls....
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