These help stop debris from entering your motor and they do a good job

These do a great job of keeping cat hairs from clogging up the water pump in the Drinkwell fountain I have

These pre-filters do a great job in keeping larger materials such as cat hair (yes, even the best brushed cat will deposit hair in the fountain) or pieces of dry food caught in their teeth from getting to the secondary filter and clogging it up.

These do a great job of keeping hair out of the pump.

They're pretty inexpensive and do a good job of trapping the hair and keeping it from flowing around or getting into the motor.

The filter does a great job trapping the food

Does a great job of keeping any large debris away from the pump.

This filter does a very great job at capturing all the things that may fall into our cats water fountain

This is an inexpensive filter that does an excellent job of filtering

They do a really good job at collecting hair and other debris so as not to enter the fountain's motor.

The filters do a pretty good job keeping the water clean

They do a great job