Welcome to Just Answer.
Why do you have this catheter?
When was it inserted?
When did you notice the silt like substance?
Do you have any other symptoms like pain, fever?
Silt or sediment can be seen in the catheter.
Urine contains cells, debris.
This can be seen as silt.
In some cases, infection can be there & increase the content of cells.
If it is a new symptom & if you have pain, fever, I would suggest to get an examination by doctor.
Doctor can take a sample for tests.
Please try to drink plenty of fluid to have good urine flow.
This would help to carry away the silt.
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