First, for the timestrip to work, you have to press down on the "button" really hard. The white strip will turn red within 30 days and it will be time to change the cartridge. On average, it needs a new cartridge once a month, dependent on the number of fish, frequency of water changes, and so forth.
It is running slowly because it needs cleaning. Unplug it and remove it from the tank. Pull the motor off of it, and take out the impeller. Using hot water and white vinegar, clean both parts. The motor pulls down at the minimum water level line on the front of the filter. A q tip works well inside the motor.
Date published: 2018-01-04