AEM Water / Methanol Injection FilterThe AEM Water Methanol Injection Filter is an in line filter that uses a micronic mesh screen to filter particulates as small as 40 microns. This allows a cleaner flow of water methanol to be passed into the engine, not only protecting the internals of the engine itself, but also the working parts of the water methanol pump, too. Run the AEM Water Methanol Injection Filter in line before the pump to protect both pump and engine.