Your comment regarding oxalate made me go look at Wiki, which says "Oxalate occurs in many plants, where it is synthesized by the incomplete oxidation of saccharides." I assumed it was a mineral that got absorbed out of the ground. Yeh, my emergency is over. My only concern now is that the gentamicin completely stops working. That would mean I'd be swapping weekly, unless the urologist refused to support that. I still don't know how he'll feel about my desire to swap in-clinic monthly and at home mid-month. I'd still like to know if the risk of infection for SPC swaps a few times a month in controlled conditions is greater (or less) than hundreds of self-cathings in the same time frame, often in public bathrooms. It was a nurse who said they don't like doing SPC swaps more often than every 3 weeks. The SPC swap is fine as long as you're not complacent in keeping things sterile. And unlike a regular indwelling cath, I've not had an SPC-caused infection. The regular caths gave me an infection every single time (or the original infection continued to replicate.) I just wish this would go away...but it's not going to.
I thought one urologist was thinking you might be regaining some bladder muscle function? Infection is always a risk as you well know. Just be very careful when you swap as it is difficult to maintain a sterile field at home. You might buy commercially-sterilized pads or similar to make it easier. I couldn't find anything available larger than 8" x 10 " but that might be large enough to help.
The current guy thought I might be able to gain some function if he reams out my prostate. I had my March 2021 UVA urodynamic sent to him, and we're getting together to discuss early next month. But regardless of how well it turns out, I won't let go of the SP tube. I won't trust that my bladder muscles are not gonna fail again, and without the SP tube I'm lost. I appreciate the "sterile field" advice. I've been buying all of my supplies at Vitality Medical since this thing started 3 years ago. I can't sing their praises enough. Prices are good, customer service is good, delivery is fast & accurate. There was a manufacturer recall on sterile water and they were on top of it, so they are not just some middle-man. I bought the same brand & model of cath swap supplies the urologist uses, including 10% providone iodine swabs, sterile gloves, and 18" x 26" McKesson sterile drapes @ 41ยข each in a box of 50 (the caths are 18" long.) I lay one out to stage the swap supplies on and drape another one across me to prevent contamination if something brushes up against me, just as they do in the clinic...although it's not fenestrated. I also bought a pump container of antimicrobial hand soap.