Mazzei injectors are a new(er) way of injecting and misting CO2 into the aquarium. They are designed to replace CO2 reactor, needle wheel, or diffuser. The technology behind the injector is provided by the manufacturer here. http://www.mazzei.net/products/injector_info.htm
. They are better at describing it than me. The advantage of a mazzei over a glass diffusers, disk diffusers, or needle wheel pumps for misting is that they can be placed inline with a pump and thus keeping equipment OUT of the tank. They require a good amount of pressure to make them work, so not any old canister filter will work. A quick search for mazzei will lead to more discussion about what others have done. I'll compile a list and add it to this thread later.
I must have spent 12+ hours trying to understand the concept of mazzei's and how to select which model will work best for aquariums and the different types of pumps / filters we use. In all actuality, I wanted to know which mazzei would work for ME. Here I will attempt to explain my system and how I am going about selecting a model to make it easier for others to select theirs.
Here is my system:
75 gallon tank with bulkheads in the bottom. I run an Iwaki WMD-40RLT to pump water through an ocean clear filter and then back into the tank through another bulkhead. The pump is rated for ~800gph and ~21ft of head pressure. Since mazzeis work best with a lot of pressure on the inlet I thought my pump would be perfect. Most canister filters do not operate at anywhere near this flow or pressure, so canister users do not assume that the same mazzei I select will work for you.
I have seen some aquarists use Mazzei models 384, 484, and 584 with no REAL good explanation why one works better than the other.
Some members have told me to use the smaller (384) model. It is know that mazzeis require decent pressures to operate. I was told that the small pumps we use in aquariums would be best suited for the smaller (384) mazzei because they would require less pressure to operate than a larger one. If you use a larger mazzei with lower pressures than the effect is larger bubbles and not as good misting. When I explained my system to an engineer at Mazzei he seemd to think otherwise. I think my pump may be more powerful than the "typical" aquarim pump.
Here is his quote. The 5psi is the psi that reads on my Ocean Clear filter. I'm not sure if that is actually the pressure that would be in "front" of the injector or not.
If I use your stated operating pressure of 5 psi (11.6), this corresponds to a pump water flow rate of ~ 10.25 gpm. If we pretend there is no pressure loss across the filter, the injector inlet would also be 5 psi. If you wanted to run all of the water through the injector, a large (and expensive) 1.5 Model 1583A would be required. Since you stated that you are going to install the injector on a bypass, there are several injector models that should work properly. I would probably select a Model 484 or 584, rather than the Model 384, as they are both more efficient (require less pressure differential to begin injection) than the Model 384. These models (484 & 584) are available with either ½ or ¾ MNPT threads, and are molded from polypropylene or PVDF.
Whichever model you decide to try, you can purchase it from one of the following distributors:
Ryan Herco 1-800-848-1141 www.ryanherco.com
Harrington Plastics 1-800-213-4528 http://www.harringtonplastics.com"
I would love to hear others opinions on this subject! I'm sure others will challenge this advice (mrkookm) but this is good so we can actaully start some good discusion about these things. I'm counting on more discussion because I still havn't decided which one to order.
For those interested, here are the prices from Ryan Herco