Degu pee puddles leave white stuff

[tolisgoal]

I've noticed this before, when I first got them but was focused on other stuff and I never mentioned it here. I just added a new shelf on my female goo's (Mpala's) cage, and I noticed that after marking it there are white puddles left. I think i've read in another post that's it's excess Calcium? I don't really know where she could be getting this extra from though. Attached pics below, please enlighten me. Ty in advance.

[tolisgoal]

I found this post, after googling instead of using DuckDuckgo. I'm commenting it in case anyone else finds themselves here with the same issue, I'm gonna guess it's nothing to worry about? Idk if data on this has changed since 2013.
Link to post: deguworld.proboards.com/thread/17923/wee-drying-white

[savvy]

All my degus have left white pee marks, not sure if its all the time, but more noticeable on wood as substrate trends to soak it up more.

[teemu]

Yeah, that's normal. It's calcium as you guessed. As Savvy says, it's pretty common, and my degus do it as well, though not always. I suspect it's essentially just self-regulation. It might be that at times they need more or less, and thus sometimes they simply dump the unneeded minerals.

Of course if it happens constantly and is really notable, it might be good to take stock of their diet. Do they have a mineral stone available at all times? That might explain where they're getting it from, especially if their feed and seeds etc already has calcium in it (many pellets are enriched with calcium from what I've seen).

[bouncy]

Yep. The white is the excreted excess calcium. Degu wee is great. Not only does it glow under black light, but it can present as a technicolour rainbow depending on what they've eaten!

[moletteuk]

That is quite a lot of calcium for one wee, perhaps this was from a morning wee when it is more concentrated?