old 5k0ol
Scurrilous
Nope its not meant to be 100% water tight. As long as most of your water flows where you want and your bubbles can't pass.
I have a thread going "My DIY Algae Scrubber" with some pics. If you cant see the union I will get a better pic of it and load it up.Yeah that's what I probably should have done. I'll have to cut the zip ties and pull it out of the pvc tube. It was a space issue I made it that way, but your construction sounds a lot easier. Post a picture of yours i'd like to see how you made it.