Here we have the electrical all cleaned up now. Just wire these up in parallel and your set to go on a 12V power source. At this point I couldn’t help testing the pumps. These pumps operate at a fairly high speed and together they resonate nicely. But there was a lot more noise pollution (a different type of pollution) than I thought there would be. When the tubes are full of water there less create less noise pollution so don’t freak out until it’s filled up.

Here we have two things going on. We decided to distribute the weight a little differently and we see the air lines running between the tubes down to the bottoms of each tube.

Close up of the frame modification, basically we will use some liquid nails (glue) to attach the two 2' boards to the frame as well as to the tubes. This will help take the load off the bottom of the frame and the ”I “shape will distribute the load more evenly.

Here is a front view of the frame with the liquid nails applied and drying. All we have left to do is the bottom plumbing.

Now we left the lines running down a little long for a reason. We need this super water tight. Insert the line into the hole from the hole saw and loop it once in that extra 1/2 inch gap we left. Using healthy amounts of a silicone (I like clear) fill the half inch gap and imbed the hose in it. A little hot glue can be used to make sure the loop of extra hose stays put.

Here is what we get when were done. Now on the first and fourth tube you can see a little glue seeped up inside the tube showing the weld on glue didn’t make a perfect bond. It’s better to try to kill these leaks now than later.

So at the end of an afternoon here is our finished photo-bio-reactor. With the parts on hand it’s a fast build and the only hold up is waiting for the glue to dry.