The simple, cost-effective paint supply system automatically takes the paint out of the circular pipe by using compressed air during colour changes and returns it to container; this will reduce the paint wastage of the colour change. The operator links the feed line to the rinsing unit. First of all the paint is removed using compressed air. This is followed by the rinse process in which the rinsing agent is pulsed through the pipes to clean them more effectively. After this, the next paint container with the new colour is connected to the system and the circular pipe is refilled.