Thanks for your reply.
Firstly I have added an arrow to show the water flow through the reactor.
Well, first off, did you "burp the reactor?
When you first start up, usually there is a lot of air in the reactor. If you don't have something built in to get this gas out, just turn the reactor upside down until all the air is purged from the reactor.
I have "burped" the reactor by using the priming leaver on my filter, this gets rid of most of the air inside and the rest clears after about an hour when CO2 is not pumped. Unfortunatly it is impossible for me to turn the reactor upside down as the filter pipes are not long enough.
Concerning the co2 line in the reactor, does it go at least 3/4's of the way down?
As you can see from the photo the CO2 line is about 3" from the top, maybe this is the problem but I though that this was where it was supposed to go. Thinking about it now though I guess the length of the reactor is necessary so the CO2 travels all the way up the reactor. If this is the case maybe I could just reinstall it the other way up, which is a shame because I used the 45 degree angle at the bottom so it lines up with my filter perfectly. I dont think I will be able to seal the hole that I have drilled at the top, any suggestions?
You could put Bio-balls or something else to impede the CO2 bubble travel to the top.
I dont really want to have to put a bio ball in it but if I have to maybe this is the answer.
However you may have more issues cleaning it out especially by having it on the inlet side (really should have it on the outlet).
I thought it had to go on the inlet side of the filter as the gas should travel up against the flow of water thus dissolving efficiently, I'm thinking that if it was on the outlet the gas would just be pushed into the tank through my spraybar and not be dissolved properly.