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Re: Sump CO2 help

(Bob Wrote)

Date: Tue, 8 Jul 2003 03:50:55 EDT
From: ROlesen104 at aol_com
Subject: Sump CO2 help


I'm buying the final components for my new 150 gal plant tank and have 
decided on using the sump system -- more for hiding the equipment than 
I'm probably going with the Iwaki MD 30RLT (Japanese model) external mount as 
the pump because I have an idea that the CO2 reactor could then be added as a 
"canister" type configuration with bio-balls, etc., for added turbulence, 
I believe this pump could handle and empty quite easily. 

It seems to my that all the DIY reactors (like I'm building) run with dinky 
little submersible pumps tend to fill with too much CO2 and not generate 
turbulence for a long-term mixing. I want all the equipment and hardware out 
of site and intend using an underwater spray bar laid along/under the 
substrate within the tank for return flow. While the RXLT models of Iwaki 
have a 
higher head and flow rate -- this model should provide enough back pressure 
empty both a CO2 reactor and UV sterilizer should the need arise. At 540 gal 
hour, this should still give me plenty of circulation and turn over, no?

Anyone had any experience with this model pump or with what I propose doing. 
The only part I haven't quite worked out yet is the securest connection to 
CO2 reactor from the CO2 line. With the anticipated pressure within the 
reactor - I don't want any leaks from the connection between the two or water 
forced up the CO2 line.

Thanks for any comments or criticism of my ideas.

Bob Olesen in West Palm Beach

Hi Bob,

Sounds like you and I have much the same project going on. I am setting up an 
Oceanic 240 gallon tank as soon as I move to my new house the end of this 
month. My tank is Reef Ready, and I am using a sump, the Oceanic Series 3, great 
for a planted tank application, and an external pump, like you.

I did a lot of research and was going to use an Iwaki (Japanese motor) until 
I found out from 5 different people, including a large aquarium supply 
distributor in this area, that while of good quality and reliable, Iwaki pumps are 
loud and can be annoying if your tank is in an area that has high traffic. There 
have been complaints about the noise associated with these pumps recently, 
per the LFS I do business with.

I finally decided on the Dolphin Aqua Sea 2100. This is a low RPM unit that 
draws less than 1 amp of electricity and has a great flow rate and can be 
throttled down with a ball valve on the output side without any harm to the pump. 
This pump also has a very low heat transfer rates. The lower the RPM, the lower 
the heat transfer. These are some of the most quiet pumps on the market 
today. If you also order the pump pad you don't have to screw it down to the stand 
and you won't be able to tell it is running. Their URL is 
www.dolphinpumps.com. They are made in your home state, I believe.

I ordered my pump thru Marine Depot, a reputable salt water/reef supply 
place: www.marinedepot.com. I should have it by Friday.

I am going to try injecting into the intake of the return pump in this new 
setup. I found a great little gadget for this from Automated Aquariums, 
URL www.automatedaquariums.com. It is their CO2 atomizer, the URL for it is 

This is an adjustable atomizer that sits inside a threaded by slip PVC tee 
that you can put on the inside of the bulkhead fitting for the return pump. Gas 
gets broken up by the atomizer, then chopped up more by the pump, then has to 
go thru several feet of return tubing which is further divided in your return, 
if you are Reef Ready.

I've never used this for CO2 injection before so I don't know how effective 
it is, but it is a slick setup and not expensive to try.


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