Oil coolant purifying attachment system, which invented by Apex, is a patented product which can be installed to a cnc machine, grinding machine and cnc lathe machine or other machine using oil coolant system. By attaching this system to any machine which uses oil coolant. The oil and other floating by products including bacteria can be separated from the coolant and the coolant can be used over and over again. The system also has an “Industrial ozone making device”, which can produce high dense ozone for disinfection and deodorization. Moreover, it extends the use of coolant and prevents the coolant going spoil. In order to cope with the rising trend of going “green”, the system has a unique function which can also reduce junk production, strengthen environmental protection and to increase the performance and efficiency of the equipment. It saves a lot of time to change and clear the coolant tank and parts of a machine.