there just up the road from me at aycliffe ind estate .i rang them for a price it was 25 quid a 25kg bag even worse news is if u want it delivered its about 9 quid postageuse beads and sand its cheaperYour best bet is here
http://www.northernpowerclean.co.uk/armex.php
At those prices I'll still be going to tesco for the 1kg boxes at 89p (last time I looked),
i would presume 90psi till it peters outWhat pressures are you running? With a blast pot or syphon feed?
i looked online and couldnt find the 1kg boxes