I finally have a brine shrimp hatchery that is neat, clean, and effective (con't)

by Michael Marcotrigiano (first published in IFGA Bulletin, September '08)

Figure 3.
Left: Bottom of V-8 bottle (but the "top" of the system) with a four inch piece of air-line tubing tightly inserted in a "slightly less than large enough" hole that is drilled into the container just above the bottom. I find no need to use sealant if you use silicon style airline tubing. This tube acts as the air vent to allow the air pressure to escape. If you forget to take off the valve (in the image it is already off) the bubbles will stop from the pressure built up in your bottle. Right: Lid of V-8 bottle with hole drilled in it that is slightly less than tubing diameter. This becomes the bottom of the system. The tubing piece (about 4 inches long) is pushed in half way and then silicon sealant is applied around it. The tubing is then withdrawn until about ½ inch remains above the lid surface pulling with it some of the sealant. After the sealant is dried I often put on a second coat, probably unnecessary, but I'm Italian and enjoy the smell of balsamic vinegar.