Every day.
You should change them after every feeding because they should be washed after every feeding.
How often should you change the fuel filter?
Monthly
if you want to be safe, every day or so
as often as needed
You should change your oil every 3,000 miles. If you drive your car rough, then you should change it more often.
everyday
How often should you change water pump in a boat
you should change it every week so it will always be clean.
every 3000 miles u should change them
The average motorist should change the oil every 3000 miles. Oil should be changed more often if driven in dusty condition.
Every week