I don't think it re-solidifies in my veins, or I guess I'd be dead already :D
Firstly, it immediately gets diluted by blood, secondly blood is warm, so probably it adds to some residue but doesn't really clog anything..
Indeed Cap H, thanks for all the amazing info I've came across here, especially in relation to the filtering.. Speed here in London is notoriously badly cut, but my lifestyle at the moment depends on it heavily as I'm relying on 2-3 day working shifts, the way I been for many years. However once you come across a good source it's OK until the source runs dry, then comes the quest for next one.. sometimes taking weeks and a lot of waste of money and body, as well as taking its toll on job and plans. Not so easy to move around at the moment, I've finally successfully settled in London and intend to stay here for the next 2-3 years.
I'll have to reconsider about the filters though. If I'd prepare lots of solution at once it would be OK although I'd also need to invest in the storage facilities. However I'm used to prepare each shot individually and due to the re-solidifying issue (96% of both good n shit stuff has it) I'm not sure I can do otherwise unless the solidifying substance is indeed filtered out in the process!
What I was wondering about is maybe I just shouldn't heat it if the speed itself is 100% water soluble? I have tried it before but subjectively there was noticeably less of perceived effect, however you can be never sure if your brain is not fooling you!