why does my water feature pump get blocked up each and every day?

I have to clean it all the time ,The filter gets ful of grass and sludge yet the water is perfectly clear.I do get a lot of birds drinking and bathing in it,could this be the reason?

Answers:
Try to keep the plants away from the pump, they''ll clog it up
also try to keep the sludge vacuumed out, the sludge will ruin
your pump in no time
I keep my pump elevated on a flower pot so that it doesn't sit
directly on the floor of the pond
Try to clean your pond out every spring and fall to reduce the amout of sludge

Other answers:
Sounds to me like it's doing it job! If the water is clear, great!
Sounds to me like it's doing it job! If the water is clear, great!
most definitely..try putting wire mess on the outside of the take in holes in the base of the fountain..this will allow water to reach the pump but keep the larger trash away from it.
Maybe the pump is too strong and the birds are being sucked up? Have you noticed a reduction of birds in your garden recently?
the water is clear because the filter is working, io dont know whaty a water feature pump is but you say birds drinkf orm it so im assuming its outside, well if its outside and animals drink from it they probably mvoe dirt and stuff into it, leaves and grass can be blown by the wind, it sucks to clean it everyday but obviously you filter is workgin properly
I knew someone would fall for that Charlie Dimmock prank.
probably cause of the birds drinking and dont forget water does turn green so it could be the slime
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