Hello, I m a t-4 paraplegic with an indwelling catheter. My urine has always had a bit of sediment in it, but lately, past 6 or 7 months, my catheter has been getting clogged up by this sand . I m using a 20fr catheter and it gets clogged in around 2 days. I ve tried drinking tons of water, 10-15 16oz. bottles a day, but the problem still persist. Don t have an UTI. What could be causing this? Thank you.