They are used in fish tanks to help clean the water, to prevent clouds of waste matter.

Collected waste matter would then be removed from the premises and disposed of elsewhere.

Another common side effect is the bleaching of solid waste matter; this may last up to 48 hours.

Stop feeding the fish, to cut down on the waste matter being produced.

People can't win out over waste matter; at some point it takes over and gets the better of them.

Right now, all the work done, all the blood spilled, seemed like so much waste matter on the landscape.

"I can use some material from Hunter's body that has already been rendered waste matter by the damage."

He says that the travellers themselves are doing some clearing up, though some waste matter will be left behind.

For this reason, they are used in fish tanks to help clean the water, to prevent clouds of waste matter.

They would use the waste matter that the Borg left over against them.