Often, we are contacted with the following comments regarding a newly purchased Machinist Venturi Mixer. It's not working or mixing It's not drawing up Just water is coming out The primary reason for these issues we find is that modifications were made to the mixer or the installation instructions were not followed. Any deviation from our recommendations for installation will affect the Venturi part of the mixer. The mixer must be hooked up in the manner we specify using the hose provided and the discharge side should not exceed 40″ in length. Recently, we were made aware that certain types of coolant may react with the brass fittings and create a gel-like substance inside the mixing chamber. Coolants containing both monoethanolamine and chlorinated alkanes is causing this issue. When this happens, the mixer will not function and you cannot use a Venturi mixer for your mixing needs. A better option would be a proportioning pump Example of correct vs incorrect hook-up. This is an example of an incorrect hook-up. A clamp and extra extender was added to the output and input intakes. This will dramatically alter the Venturi mixing capabilities resulting in the device not working. The correct method to hook the mixer up is illustrated below. The discharge hose that is supplied must be used and installed per the picture below. The discharge hose is limited to 40″. Any modifications to the hose to exceed or shorten it will affect how the unit work. Again, you are inadvertently affecting the venturi mixing effect and the device will not function. Following the supplied instructions will guarantee your Venturi machinist mixer will work correctly. If still experiencing issues please contact technical support at 440-528-0699 for assistance.