Crankinit, I once vomitted hardcore the day after codeine on the way to work, I only filtered squeezing through a shirt and didn't use coffee filters. The solution was VERY cloudy and I drank it anyway, I noticed abdominal pain during the high and chalked up the abdominal pain and vomitting the next day to too much paracetamol getting through.
I am curious if you take any sort of antihistamine with your codeine? I have found them to reduce nausea significantly, I reccomend 25-50mg of doxylamine succinate (brand name 'restavit') which is an OTC sleeping aid. Best to take them 45 minutes to an hour before ingesting the codeine.
If you don't already use antihistamines then I highly reccomend giving them a go before writing off codeine. Before I started using them I always noted significant nausea and itchiness while using codeine, although I only actually vomitted that one time. When taking antihistamines the nausea is pretty much zero and the itching is signficantly reduced.
Bludda I have perfected my technique using panafen plus, and it does always come out very clear after filtering once through a shirt and then again through 2 coffee filters. I don't have a whole lot of experience with other brands to compare them but after this pack is done I am definately going to try extracting with some paracetamol based brands. I was not aware that a solution being "too clear" could be considered a bad thing?