Very hard to find, the kind of air/water injection system.Their used to be the Terravent system,they flopped..
A big decompaction contractor in my area had to build his own machines,he pumps calcified seaweed into compacted areas ,mainly golf greens,race courses.
I'm skeptical if this guys rigs are reliable,he always seems to be into some stage of development lol,though at least he's trying!!
http://www.terrainaeration.co.uk/