If you look at this page:
TED 5000-G Home Electricity Monitor
It recommends the filter if...
Quote:
*My house is large or has many fluorescent or LED lights, dimmers, electronic equipment, home office equipment, surge suppressors, etc.
...
TED uses Power Line Communication (PLC) to transmit data between the electrical panel and Gateway. PLC can be affected by noise on the powerline caused by switching power supplies (electronics, computers, dimmers, fluorescent lights).
An in line filter is installed inside the breaker panel with the MTU and helps to block out noises on other breakers that may affect TED's communication.
A plug in filter is designed to block a nearby appliance (such as a computer or power strip) from TED. The plug in filter is connected directly between the appliance making electrical noise and the wall. The plug in filter does NOT connect directly to the Gateway.
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I don't have a filter and really don't have any problems.
You can view your TED info with a laptop, tablet, or smartphone. The software is web based. So there is no need for the display IMO.