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Nice build Rob. 👍 Looking forward to seeing how it operates for you next season.

Nice design! Looks like it works great!

Good idea. To increase circulation you might try putting an extension in front of the pumps that puts the nozzles at the other end of the bed but turn one pump and nozzle system around. So water is pumped to the opposite end of the tank to be jetted at the other pump to be pumped back up the other end in a continuous cycle. The 2 halves of the tank would have the flow going across them in opposite directions. Another possibility would be to position the pumps in the middle of the tank (also on the walls) with one nozzle hose going to one end corner while the one on the other side goes to the opposite corner. It would be a similar effect with water going in opposite directions in each end of the tank. Cross the streams. And check out Speece cones for the most efficient Venturi effect. Thanks for the vid.

Awesome build, and a great video thanks for sharing

have you considered the first setup with the nozzles on one manifold facing north and the others facing south? Then you would generate a circular circulation pattern. I suspect the low oxygen away from the nozzles is partially from the rotting sediment consuming oxygen from the water.

Dude it looks beautiful !!!

Awesome job mate!

Brilliant Design 🎉

Awesome work and great in-depth information! You earned my sub sir!

Excellent video!

Really cool build. Doing a lot in line is smart thinking. I'm currently experimenting with combining a venturi with a vortex chamber to try to keep the bubbles in there a little longer to increase their ability to dissolve into the water. Great work! Thanks again for collecting and showing us your data!

Awesome video!

Wonderful and so interesting.

Excellent job

You could harvest all the sediment and use it in dirt beds for fertilizer. Also, aeration of the tank keeps algae from growing. Algae doesn't like oxygen!

Hermano, si ponés un tubo por cada difusor tendrías más caudal de aire. Sdos desde Posadas Misiones 👏 👏 👏

For a better mixing you could place the nozzle on one side of the bed and the pump on the other side, that way you always have a good mixing

Nice setup! FWIW re sediment, I was talking with Dr. Savidov a few years ago, and he talked about how they had experimented with using jets of water to keep the sediment cleaned off. He started with a 2” pipe drilled with a line of 1/4” holes (I think). But when he pointed the holes downstream, the sediment drifted upstream. So he pointed the holes upstream and the sediment was pushed further downstream. The reason (it seems) is that the injection of the water increases the pressure, so the rest of the water and the sediment in the water tries to go to the lower pressure (upstream, in the case of the jets pointing downstream). Just a thought on how you could think about periodically encouraging your sediment to evacuate the tank, without disrupting your plant growth.

Just starting to watch. Hoping to see a Venturi like I have for my pool spa jets. Very simple and low cost. Let’s see what ya got

Pretty cool. Its awesome we can 3d print stuff we need :)

Good job!

Suggestion for easy cleaning of your bed... Get a 1/2hp dirty water sump, I got mine from harbor freight for $68. Put it at one end with the hose laying over a large foam rubber pad to collect the debris, Squeegee everything towards that end and let the clean water run back into the bed. I own a pool company and we use this method on extremely dirty pools to keep it out of the sand filter... Might take 2-3 cycles but you can leave the pump running over night, as long as the foam doesn't fill up with debris it will continue to clean all night. Then when the foam is full, take it to the garden, turn it dirty side down and run water through it to feed to garden or yard...

Use aquarium plants. They can help anchor the sediment to the bottom, help condition and clean your water. You can even collect local species like Hornwort and then put it in your system.

For the snorkel problem at 4:30min you could make a big manifold for the small manifold that way you only would have one big snorkel in one corner.

Putting fish in the water may help keeping it cleaner and give plants natural nutrients.After seeing your graphs I thought nasals could be 4 feet apart.

Tap/Thread is a much better idea than glue. It looks like another system on the other side would do a good job of moving the water but do you want the whole 100' tank to circulate or run from inlet to outlet?

Great build. Just curious about pump specs. Could you kindly share pump specs. Thanks.

looks nice . do not down size the piping . instead upsize it . if the pump calls for an inch and a half go to two inch . this will give you more flow . instead of ending the piping connect all end so they continue. this will allow you to use less pumps and get more flow per pump used .

Would a diffuser plate work to further spread to surface area?

I was in the middle of building something very similar for my DWC buckets. The youtube video I was watching ended and this video auto played. Very fortuitous. I love the ingenuity and experimentation. The second air rail as opposed to just having a tube sticking straight up off each nozzle is brilliant. If you only used the first 10 nozzles do you think you could get away with 1 inch pipe? And with either 1" or the 1.5" you used here, would you say you had equal flow at each nozzle? What pump size would you recommend for 10 nozzles?

Hello sir.. Can we make with just two reduers? Joint thier low side and make a hole in centre?

have you got an STL file for your Venturi?

This is awesome, but I wonder what the results would be with an underwater oxygen battery? Take a 3 inch PVC pipe, cut it in half, suspend the half pipe upside down so that it traps air. If atmosphere is 21% oxygen and water is 1% oygen, would the additional contact diffuse slower with less energy?

How does the aeration compare between airstones and venturi tubes? I'd love to see how DO compares instead of DO levels between no aeration and venturi. If Venturi is cheaper and more efficient, it seems like a no brainer to switch.

Perhaps in a redesign of the venturi you could make a clamp for the air tube or a clip.

What printer did you use to print the nozzles?

Thanks for the video. What kind of program are you using for the CAD and #D printing?

ever thought of whether it improves our oxygen metabolism too by drinking it? some studies show that it helps against cancer. treating drinking water for cattle and birds may prevent disease spreading like birdflu.

I follow your channel from the beginning and I really like all your projects ... I would like to offer you a suggestion that could be an interesting (I guess..) experiment for the system developed by you based on the Venturi tube .. You can practice a little the hole on the inlet pipe of the water pump, in which you can insert a thin hose through which the water pump sucks a very small amount of air. In this way, the respective air will be nebulized in the pump rotor without the risk of operation in cavitation mode. With this simple addition I believe that you will get air microbubbles that will improve aeration and at the same time you will have movement in the body of water that you want. Plus, this little innovation could be the theme of a new video that I would be very curious to see him ... I presume that you will get that remaining fog of air in tha water wich make aeration much more efficient...

Any idea what effect it has on greenhouse and water temperature.?

I think I missed it in the video but what size pump are you using?

is there only one size of this nozzle available? i want to use it but for a different application but will need something with bigger than a 7 mm hole

Would this somehow work for compost tea brewer? If so, say in a brut 35 g system, how many nozzles do i need to attain minimum 5.5 ppm level?

This is a very clever design. Is it cheaper and as effective as running a large air pump?

What if you put one system in the center of the bed a pump 4"x10' pipe, 3"x10' pipe, 2"x10' pipe, 1"x10' pipe, 1/2"x10' pipe, 1/2"x10' pipe, 1"x10' pipe, 2'x10' pipe, 3"x10' pipe, 4"x10' pipe, pump with an air manifold the entire 100 foot length with nozzles pointed in both directions toward the sides of the beds? Would you get uniform oxygen saturation? Would you get uniform pressure?

Hi, nice done. How deep in the water can you place the venturi before the air can’t come down anymore?

Wht size pump fitted to the 20 nozzles. Meaning how many liters of water does the pump out put for 20 nozzles

Will you be adding these to your shop?

Also, what kind of resin do you use for your prints? I was under the impression that most 3d printable resins aren't fish or food safe. Clearly I've been misinformed.

I would suspend the system higher in the water and point it down.... closer to the surface the more air it will pull.. from my experience with power heads on fish tanks

I'd be happy to buy a half-dozen of those nozzles from you for my own system. DM me to make arrangements, if you want to get into that.

Stupid question maybe but do venturi aerators work installed vertically and pushing water up a pipe?

what about using a impeller (on motor) to both stir air into water and to circulate the water at same time?

23*C isn't too high therefore 80% saturation isn't a big thingy. I would suggest using only one pump and one venturi feeding into a vertical pipe (from the top) with increasing diameters (to the bottom) and exiting with the same diameter you came in with. Then distribute it through out the raft as you did - the result will be the creation of very small bubbles which have a thousand times more surface are for the same air therefore increasing solubility big time. I managed to have 83% oxygen saturation at a water temperature of 35*C. If you want I can send you a video I did showing you this. Let me know.

If one was trying to keep the part count down, for a simpler system, would a waterfall type of aeration feed by aquaponics circulation pump do the job❓

When using a Venturi device you may be converting water into its fourth phase

water gets saturated by o2 quickly. I've found a little does a long way.

If adding a second, why not put the pumps at opposite ends of the 20 feet.

Will you be making these available for purchase?

👍👍👍👍👍

hi dude!

Why not use a Siphon mechanism with a DWC. If only the rafts would sit/rest on something in the first few cms (eg 2cm ), one can siphon easily 10 cm i guess. Such a design would give plants enough time to breath. You just need a huge Sump. Has anyone tried this ?

Could you let us know the flow rate of the pump?

would this work for a fish pond

in 124 watts youll get 16.5 liters per minute,,,,, i better choose the air pump,,, like resun LP100,,,(100 watts) they claimed it can generate 140 liters per minute,,,, even if resun was half true,,,, Many things for this video,,,

Aloha!

You a need a solids filter

JC!!!

Look into NANO BUBBLES. AMAZING! AMAZING BENEFITS!

Wanna sell some of the ventures you made

Air lift pumps. Higher oxygen levels, and it breaks down your solids.

I think if my beds were that filthy I'd be to ashamed to show it on YT!