I have to keep 3 650 litre systems running in work. I find I don't tend to cause the same problems to machines that I find other lads cause. Dropped poles, air locked Pumps and one guy even thought it would be a good idea to rip all the wiring and contollers off a machine. Love how I get the ear ache for these things. It was even my fault when pure freedom up dated their poles making our poles obsolete!