We have a 1/2″ iron pipe that provides domestic water to a commercial building. Water usage is not substantial, but flow has decreased. It appears to be rust/scale in the pipe (flow is good at the meter). The pipe would be difficult to replace. Is there a tool/snake made that is rotated in the pipe, removing some of the rust/scale? I realize this is a temporary measure, but the building does not require a lot of water volume. Thanks.