3rd generation
i used it all chrises pump-n pose and the 3rd generation esik-clean sold at zoelabs is by far the longest lasting and its a third of the price
ive used chris clark version and esik clean from www.carvagen.com ,had major pain with the clark version ,but i had better results from the esik-clean from carvagen ,no pain and got an inch on bi's tri's and calves for like a 4th of the cost of the clark version
i use synthol synthol by rubbing it on the results lasted and it was half the price and it was clean not that crap from chris clark either i used it before and had alot of breakouts,but this stuff called esik-clean was good for a fraction of the price of his and it was 100 % guaranteed to work...