Anyone use one of these little guys? Aliexpress venturi.

[Pawtz]

I bought one of these venturi things from aliexpress last year, but never got around to using it until now.
Was curious if any of you have something similar and find it to be viable for replacing airstones with.

It makes bubbles. I have to attach tubing to it to extend it. Not sure how many bubbles I need. It's a 7gal homedepot tote (seems closer to 6 1/2), but I plan to use around 5gal max.

https://imgur.com/U2ssWhG

 

[hostagecs]

put a air stone at the end of the hose, it will aerate the water more

 

[Gemtree]

Way more bubbles

 

[marzig]

It's not the bubbles that oxygenates water. Oxygen exchange naturally occurs only at the water's surface. Bubbles just insure that more water is exposed to the surface.

 

[hostagecs]

It's not the bubbles that oxygenates water. Oxygen exchange naturally occurs only at the water's surface. Bubbles just insure that more water is exposed to the surface.

if the bubble size is small enough it most def helps with oxygen exchange

 

[marzig]

if the bubble size is small enough it most def helps with oxygen exchange

As someone who was an active aquarium hobbyist for over 25 years breeding and raising freshwater angel fish and then maintaining living reef saltwater tanks I respectively disagree.

The size of the bubbles is irrelevant other then speeding up the movement of water there by increasing the surface area where the oxygen exchange occurs. You simply cannot force oxygen into solution except under very high pressure and only with pure oxygen.

None of my saltwater reef tanks ever had a single air stone in them. The water was oxygenated when it flowed through an overflow and trickled down and through a sump type bio-filter that removed ammonia and other waste by aerobic bacteria and then returned to the main tank. I did use air stones in my freshwater breeding and fry tanks only to power air lift tubes that moved water through sponges that had colonies of aerobic bacteria that consumed the waste ammonia.

 

[hostagecs]

As someone who was an active aquarium hobbyist for over 25 years breeding and raising freshwater angel fish and then maintaining living reef saltwater tanks I respectively disagree.

The size of the bubbles is irrelevant other then speeding up the movement of water there by increasing the surface area where the oxygen exchange occurs. You simply cannot force oxygen into solution except under very high pressure and only with pure oxygen.

None of my saltwater reef tanks ever had a single air stone in them. The water was oxygenated when it flowed through an overflow and trickled down and through a sump type bio-filter that removed ammonia and other waste by aerobic bacteria and then returned to the main tank. I did use air stones in my freshwater breeding and fry tanks only to power air lift tubes that moved water through sponges that had colonies of aerobic bacteria that consumed the waste ammonia.

smaller bubbles create more surface area for the exchange, the method you describe without air stones does the same exact thing, creates more surface area.

 

[Hook Daddy]

As someone who was an active aquarium hobbyist for over 25 years breeding and raising freshwater angel fish and then maintaining living reef saltwater tanks I respectively disagree.

The size of the bubbles is irrelevant other then speeding up the movement of water there by increasing the surface area where the oxygen exchange occurs. You simply cannot force oxygen into solution except under very high pressure and only with pure oxygen.

None of my saltwater reef tanks ever had a single air stone in them. The water was oxygenated when it flowed through an overflow and trickled down and through a sump type bio-filter that removed ammonia and other waste by aerobic bacteria and then returned to the main tank. I did use air stones in my freshwater breeding and fry tanks only to power air lift tubes that moved water through sponges that had colonies of aerobic bacteria that consumed the waste ammonia.

This has always been my understanding as well. The air stones simply and efficiently move the water on the surface, displacing the water as the bubbles arrive at the surface, and the disturbance and movement of surface water is all the bubbles provide.

 

[hostagecs]

so if you generate 1 bubble thats a gram in size, you create surface area, if you create 1 million bubbles that have the same total 1 gram collective size you create more surface area.

 

[hostagecs]

 

[hostagecs]

and for the record i never said the bubbles get forced into the water, that was just pulled out of thing air, i said size of bubbles matter because when they pop up to

 

[Hook Daddy]

I think we’re saying the same thing basically. The more surface area of the water that’s disturbed, the more oxygen is dissolved into the water.

 

[hostagecs]

im saying to op, if he use this use a air stone because it will provide more benefit when the small bubbles pop and aerate the water, will it be enough? i have no idea, but imo its better than nothing

 

[marzig]

and for the record i never said the bubbles get forced into the water, that was just pulled out of thing air, i said size of bubbles matter because when they pop up to

My apologies for jumping to that conclusion! I guess that comes from me trying to explain this to people over the years.

 

[Pawtz]

So it seems like the bubbles need better spacing so bubbles do not meet each other at the top?

So the big bubbles would technically be fine as they would create a bigger pop at the top of the water whereas the same pop might take 3-4 smaller bubbles to create the same surface agitation?

I will make a air stone w/ a bottle cap and cloth to see the difference in how much area is covered. Feeling a little confused at the moment

& thanks for all the replies.

 

[hostagecs]

just think like this 1 bubble better than no bubbles, however 1 million little bubbles way way better

 

[hostagecs]

the pops at the top of the water are what you are after, this is where 99% of the air goes into the water if you will and turns into dissolved o2. its the turbulent effect which causes the change is how i understand it. henrys law describes gas exchange of the bubbles in water before they burst, the more pressure the more exchange, but in the setups we are running thats close to zero

 

[marzig]

When I shipped young angel fish to a wholesaler in Chicago I had about a 4.5 hour drive. 200 fish went into a plastic bag that was in an insulated shipping container that measured about 16x16x12 inches tall. The bag only needed about 2" of water. I'd then purge as much air out as possible and then refill with oxygen from a tank and seal with rubber bands. Just the movement of the car was enough for the water to stay oxygenated and I never lost any fish.