iRobot 300 - Manual (Page 13)

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Cleaning the Filter Bag
It is very important to clean Verro’s filter regularly in order to keep it running at
peak efficiency.
The fine filter bag can trap particles as small as two microns across.
(For comparison, the period at the end of this sentence is more than 500
microns across.) These small particles can clog the filter bag, reducing the
amount of water that Verro can pump. Since Verro uses the water it pumps
both to clean and to move around, a clogged filter can significantly reduce
Verro’s effectiveness.
The mesh filter bag is less susceptible to clogging from small particles, but it
will also eventually become clogged by larger particles such as leaves, acorns,
etc.
1
Turn the Power Supply OFF, unplug the floating power cord from the Power
Supply, and remove Verro from the pool. Please keep the plug away
from water.

Place Verro upside down on a towel (to prevent scratches).

Unlock and remove the bottom panel by pushing the two locking tabs
toward the sides of the robot.