An electric eel uses a rotating mechanical cable and suitable cutting/clearing head to work through certain physical drain obstructions. It can be useful where a blockage needs mechanical cutting or penetration and the access and pipe condition are suitable.

Electric eel service: $350 including the call-out and up to the first hour. Additional eel time: $75 per 30 minutes.

AAA Drain Cleaning Services – Website Developer Implementation Brief | 6
The electric eel is not automatically the right tool for every blockage, and it does not necessarily clean the entire internal bore of a pipe. AAA selects the equipment based on the blockage, access and pipe condition. Where flushing/cleaning of build-up is required, high-pressure jetting may be the more suitable method.

If the service level changes after work starts, any initial amount already paid is credited toward the upgraded service level.