The inlet for the cooling comes from the pump a small plastic fitting with about 10 small holes in it to stop big stuff going through the exhaust system so it would take much to block it but as you travel it should push through.
If you ride where there's lot of crap in the water not much you can you about it just try to keep out f it.
I would could check your coolant level on the bowl first and give it a good flush the hose as hard as you can get it.
If you have a compressor you can get it ready start the ski then just give it a few quick blasts of air up from the flush it hose this can blow crap back out from where it came.
Other wise if that doesn't may have to take the pump off to have a look
If you ride where there's lot of crap in the water not much you can you about it just try to keep out f it.
I would could check your coolant level on the bowl first and give it a good flush the hose as hard as you can get it.
If you have a compressor you can get it ready start the ski then just give it a few quick blasts of air up from the flush it hose this can blow crap back out from where it came.
Other wise if that doesn't may have to take the pump off to have a look