The GrowBot looks much better when you keep it clean.
Keep the tops clean.
When you are pulling plants remove any dead roots you happen to see. I normally just pick up with my fingers.
The water in the GrowBots is alive, a good alive the roots of your plants are constantly cleaning and the circulation pumps keep the water moving so it is not stagnant.
Occasionally you will need to clean a pump. Either the pump gets jammed with debris or get pushed a little off center and start making noise.
You can also use a queue tip to clean around the inside of the pump housing.
I twist the queue tip and in just a few revolutions it is normally all done.