[untamed]

Originally Posted by mark

The one thing I seen to be missing is why all the effort either sealing or using fittings where the 1/4" tubing passes into the PVC?

I'm assuming the 1/4" tubing inside the PVC is a continuous loop, the PVC is just to contain the 1/4" in a dark environment and bio-balls are put in, in same plans, just the hold the coil's shape. Wouldn't it work just as well if a couple of holes drilled in the cap a the line passing through?

Hmmm...I think that the coil delivers low oxygen water to the bottom of the chamber, then the water filters up through the bioballs. Based on this, the holes up top would have to be sealed well, but there would be little pressure against the seals.