Rex Grigg C02 Reactor Trouble - The Planted Tank Forum
 
LinkBack Thread Tools Display Modes
post #1 of 11 (permalink) Old 11-26-2008, 08:14 PM Thread Starter
 
PTrader: (0/0%)
Join Date: Jan 2008
Posts: 105
Rex Grigg C02 Reactor Trouble

Hmmmph..

Whoever said change was good?!

Dunno WHAT is going on with this Rex Grigg CO2 reactor..

Making loud clicking noises, and the bubbles aren't well diffused at all..

Takes about 3 times longer at the same rate to get my pH to set point than it did with my diffuser..



Have I got the thing hooked up backwards or something??



I got him to put it together, so not really sure what's going on inside the thing..

I assumed that the CO2 inlet was supposed to be closer to the bottom (the inlet), as the point is to give the bubbles time to diffuse).

Anybody know?
DougZ is offline  
Sponsored Links
Advertisement
 
post #2 of 11 (permalink) Old 11-26-2008, 08:46 PM
Planted Tank Enthusiast
 
brohawk's Avatar
 
PTrader: (34/100%)
Join Date: May 2008
Location: Seattle, WA
Posts: 621
You mean the bottom is the OUTLET, right?
brohawk is offline  
post #3 of 11 (permalink) Old 11-26-2008, 08:51 PM
Planted Tank VIP
 
Gatekeeper's Avatar
 
PTrader: (96/100%)
Join Date: Feb 2007
Location: Earth
Posts: 6,628
yes... in at the top, out at the bottom. You are holding it the way it should be installed. This is probably why you are not getting good diffusion, you are pushing the gas right out of the reactor. You need to use gravity to your advantage.

The premise is, the CO2 gas tries to rise, while the inflow (coming from the top) pushes past the gas to go to the outlet at the bottom then back up to the tank. That "contact" time between the inflow and the gas is what causes the diffusion into the water column.

There should never be "clicking" btw. Rex I believe builds those "hollow", ie. nothing is inside of it.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Gatekeeper is offline  
 
post #4 of 11 (permalink) Old 11-26-2008, 09:05 PM Thread Starter
 
PTrader: (0/0%)
Join Date: Jan 2008
Posts: 105
D'oH!!

Ok, thanks fellas..

Got it ass backwards..

Guess I should have asked about this before I went ahead and installed it.. LOL

Thought it was straightforward enough, didn't want to make an ass of myself....

Mission accomplished, eh?
DougZ is offline  
post #5 of 11 (permalink) Old 11-26-2008, 09:07 PM
Planted Tank VIP
 
Gatekeeper's Avatar
 
PTrader: (96/100%)
Join Date: Feb 2007
Location: Earth
Posts: 6,628
FWIW, I usually mount mine in the stand, close to the filter. This increases the contact time up the outake if you do get some residual gas build up.

Just a suggestion though.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Gatekeeper is offline  
post #6 of 11 (permalink) Old 11-26-2008, 09:13 PM Thread Starter
 
PTrader: (0/0%)
Join Date: Jan 2008
Posts: 105
It'll have to wait till I can buy some more filter tubing.. LOL

But thanks, I'll do that..
DougZ is offline  
post #7 of 11 (permalink) Old 11-27-2008, 01:12 AM
Wannabe Guru
 
essabee's Avatar
 
PTrader: (0/0%)
Join Date: Oct 2006
Location: Ranchi, Jharkhand, India
Posts: 1,012
I use a very similar hollow reactor which I make out of lengths of 2" dia pipes. The water comes in at the top and exits from the bottom. I introduce the CO2 at venturi spot very near the entry point of the water into the reactor. My logic is that the gas will breakup into small bubbles which try to rise against the flow but cannot escape and ends up in solution (if the length of the 2" pipe is adequate).

If you have a choice, you have a problem, till you elect your choice. No choice, no problem, only consequences, learn to live with them.
essabee is offline  
post #8 of 11 (permalink) Old 11-27-2008, 01:21 AM Thread Starter
 
PTrader: (0/0%)
Join Date: Jan 2008
Posts: 105
Got a pic?
DougZ is offline  
post #9 of 11 (permalink) Old 11-27-2008, 03:37 AM
Wannabe Guru
 
essabee's Avatar
 
PTrader: (0/0%)
Join Date: Oct 2006
Location: Ranchi, Jharkhand, India
Posts: 1,012
I don't have a particular picture to show the reactor but this closeup of my UGF setup can give an idea. The green pipe in the corner is the reactor. The red pipe at the bottom is the exit spray bar. The pump output is the vertical white 1/2" pipe which lets the water in at the top of the reactor. The CO2 enters the reactor at the elbow just above it.

If you have a choice, you have a problem, till you elect your choice. No choice, no problem, only consequences, learn to live with them.

Last edited by essabee; 08-28-2009 at 01:04 PM.
essabee is offline  
post #10 of 11 (permalink) Old 11-27-2008, 04:54 AM Thread Starter
 
PTrader: (0/0%)
Join Date: Jan 2008
Posts: 105
Interesting..
DougZ is offline  
post #11 of 11 (permalink) Old 11-28-2008, 04:31 PM
Algae Grower
 
PTrader: (0/0%)
Join Date: Dec 2004
Location: Walnut Creek, CA
Posts: 111
Send a message via AIM to JHipkin
I built Gregg's reactor using a venturi loop as well. I used some rigid tubing that I pushed an inch or so into the top of the reactor. Once the bubble gets large enough the CO2 flows back through the venturi loop into the intake of my canister filter. This works great for me.
JHipkin is offline  
Reply

Tags
None

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome