Quote Originally Posted by LukeXE
I know that wdrzal, Ricky has written, that he will do some test with co2, so my advice is to use R290 with CO2, that will help with dry ice problem

For sure R23 is really good refrigerant, I think the one of the best with ethane in -90*C refrigerants range. Next jump is ethylene...
508 is beter!!! look at unseen's cascade that 631 cedar mill is puting out 300+ watt lol(i sthis for real? the site said so) best mass(kick ass of ethane etilene r23...), myself i consider it beter than 1150