1. Don't run the pump with a wonky timer!

2a. Either fix the timer, and get enough tripper to run 3x per day for 30 - 45 minutes each time OR
2b. Get a new pump

3. You might want to consider keeping the filter. One of the nice things about cartridge filters is, you can't get one that's too big. With this filter, you'll likely only need to clean it 1x each year -- preferably before closing.