Elvin;
Took a re-look. I'm more worried about the amount of pressure it will take to get it to bubble past the inverted 5gal bucket.
Since the unit is sending the "gobar" off to the other inverted 5 gal bucket full of water( which is a good design) sitting in a 33 gal bucket and has a steel weight plus conduit on it. There's the ability to have a good amount of pressure to build up.
If the unit is as the drawn picture shows , then the pressure will back fill the to slurry before the bubbles come out from under the "storage" tank.
a very simple math, ( Finn can help better with this, he's got a real good grasp on math) Finn if you have the time can you correct this for me?
1 inch column of water is ~.44 psi, gravity pushes on us about 14lbs. A small steel plate say 4inches round 1/4inch thick plus condiut say 2lbs.
A 5 gal bucket is say 14 inches tall.
So 14 inches times .44= 6.16 + 14 +2 = ~~ 22psi. This is above the normal ~10 psi BBQ grills regulators run at.
So by the time the bubbles start to get out from under the 5 gal bucket it's already up to 22psi and will have back fed into slurry. Making big yucky mess :-)
I could be way wrong on this!!! don't take this as a slam or anything, just trying to keep anyone safe.
I could even be reading the drawing totaly wrong.
Cheers
Bruce S