Definitions for "Micro-filter"
A device which plugs into your phone socket designed to counter interference on the phone line.
a filter capable of removing very fine particles: even dead algae and bacteria. Some Robotic Pool Cleaners feature a built-in micro-filter that works in conjunction with the pool filter to produce higher quality pool water.
a special adapter that you need to use on your phone line, so that your telephones do not interfere with your ADSL connection