Hey all,
Myself and another member Helgymatt are having the same issues with our Mazzei venturi setups. The issues
we have do not seem to be common or apply to the many folks that use venturis.
I will describe the 2 major issues we have and some details on our individual setups. Any help/thoughts are appreciated....
Matt, please add any corrections or omissions.
Common Issues:
1. Mist/bubbling from the venturi when the c02 is OFF.
2. Noise (hissing) from the venturi as long as the venturi gets pressure. I can keep my venturi loop open about 40% and that eliminates the majority of the noise, but it still 'mists'. Mine is extremely loud when fully open and can be heard over the tv. It also has regular louder bursts when open.
If the venturi loops are CLOSED completely, both of these common issues disappear for both of us.
My noise is much worse since my upgrade in plumbing which is detailed here. Be warned, it is a lengthy thread....
http://www.barrreport.com/co2-aquatic-plant-fertilization/4632-mazzei-uv-placement.html
Again, these issues are only when the venturi is getting flow.....
Individual issues:
1. Gerry - Sub-optimal performance in terms of rapidly decreasing ph per my ph meter. New Hanna coming soon.
2. Gerry - daily large variance in both DC color and ph meter readings, when all parameters (bubble rate, etc) seem the same. No consistency.
1. Matt - No apparent difference in mist when the throttle valve is adjusted. I do show some mist difference when the pressure is increased.
Details:
Matt
Tank volume : 75 gals
Pump : Iwaki WMD-40RLT @ 800 gph with 21' max head.
Plumbing : A wye splits this flow between an OC canister and the venturi.
The venturi leg and the OC leg have separate ball valves for flow control. There is very little distance between the pump and the venturi.
Other components : I think he is also running an inline heater or UV after the OC, but before it is joined with the venturi output.
Mazzei model : 384.
Sump/wet/dry : N/A
Gerry
Tank volume : 180 gals
Pump : Pan World 250 PS @ 1950 gph with 45' max head.
Plumbing : A T splits this flow between an NC canister and the venturi.
The venturi leg and the NC leg have separate ball valves for flow control. There is some length to the venturi loop due to flex hose configuration and lack of space.
Other components : N/A
Mazzei model : 584.
Sump/wet/dry : yes
I get a very good suction at the venturi intake port, and per the mazzei website, this indicates that the venturi is 'working'.
It seems that we are both at an adequate pump size for our configurations.
However, we both get better pearling (Matt please confirm) than before.
I will be swapping to a 384 model when it arrives soon (I hope) and will see if this helps. I will also try to shorten my venturi loop somewhat.
I know that Tom has been advocating plumbing an air line into the venturi at 'night' and c02 is off to add 02 at night. Since we have such heavy cavitation, bubbling, mist, is this accomplishing the same thing, albeit inadvertently?
I have also read other threads where folks say that an injection of air, increased their pearling rate. Can this be the cause for the increase in pearling we observe?
Any thoughts or experiences are welcome as they can provide clues, ideas, or benchmarks.
We have both been experimenting with different configs, flows, pressures, etc for several weeks now with some, but not total success.
As always, thanks very much in advance.
Myself and another member Helgymatt are having the same issues with our Mazzei venturi setups. The issues
we have do not seem to be common or apply to the many folks that use venturis.
I will describe the 2 major issues we have and some details on our individual setups. Any help/thoughts are appreciated....
Matt, please add any corrections or omissions.
Common Issues:
1. Mist/bubbling from the venturi when the c02 is OFF.
2. Noise (hissing) from the venturi as long as the venturi gets pressure. I can keep my venturi loop open about 40% and that eliminates the majority of the noise, but it still 'mists'. Mine is extremely loud when fully open and can be heard over the tv. It also has regular louder bursts when open.
If the venturi loops are CLOSED completely, both of these common issues disappear for both of us.
My noise is much worse since my upgrade in plumbing which is detailed here. Be warned, it is a lengthy thread....
http://www.barrreport.com/co2-aquatic-plant-fertilization/4632-mazzei-uv-placement.html
Again, these issues are only when the venturi is getting flow.....
Individual issues:
1. Gerry - Sub-optimal performance in terms of rapidly decreasing ph per my ph meter. New Hanna coming soon.
2. Gerry - daily large variance in both DC color and ph meter readings, when all parameters (bubble rate, etc) seem the same. No consistency.
1. Matt - No apparent difference in mist when the throttle valve is adjusted. I do show some mist difference when the pressure is increased.
Details:
Matt
Tank volume : 75 gals
Pump : Iwaki WMD-40RLT @ 800 gph with 21' max head.
Plumbing : A wye splits this flow between an OC canister and the venturi.
The venturi leg and the OC leg have separate ball valves for flow control. There is very little distance between the pump and the venturi.
Other components : I think he is also running an inline heater or UV after the OC, but before it is joined with the venturi output.
Mazzei model : 384.
Sump/wet/dry : N/A
Gerry
Tank volume : 180 gals
Pump : Pan World 250 PS @ 1950 gph with 45' max head.
Plumbing : A T splits this flow between an NC canister and the venturi.
The venturi leg and the NC leg have separate ball valves for flow control. There is some length to the venturi loop due to flex hose configuration and lack of space.
Other components : N/A
Mazzei model : 584.
Sump/wet/dry : yes
I get a very good suction at the venturi intake port, and per the mazzei website, this indicates that the venturi is 'working'.
It seems that we are both at an adequate pump size for our configurations.
However, we both get better pearling (Matt please confirm) than before.
I will be swapping to a 384 model when it arrives soon (I hope) and will see if this helps. I will also try to shorten my venturi loop somewhat.
I know that Tom has been advocating plumbing an air line into the venturi at 'night' and c02 is off to add 02 at night. Since we have such heavy cavitation, bubbling, mist, is this accomplishing the same thing, albeit inadvertently?
I have also read other threads where folks say that an injection of air, increased their pearling rate. Can this be the cause for the increase in pearling we observe?
Any thoughts or experiences are welcome as they can provide clues, ideas, or benchmarks.
We have both been experimenting with different configs, flows, pressures, etc for several weeks now with some, but not total success.
As always, thanks very much in advance.