Safe to use Old urine for enemas?

Given the higher concentration of ammonia in old urine, is it still safe to use as enemas? There is conflicting information on the internet so I'm quite confused.

Will the ammonia kill the beneficial gut flora in my large intestine?

Thank you very much in advance for any suggestions/comments!

I am trying to get rid of my severe candida full body rash breakout by using UT drinking and enemas so hope to get a reply soon!