Maybe a bad seal(wax ring)-we use and sell the Tramex brand (non intrusive) moisture encounter plus.
Clients love meter and tools like that-saved my ass many times by finding moisture beneath floors we may have worked on.

On Thu, Aug 17, 2017 at 7:27 PM, Justin Cameron <justin@jmcstoneandtilecare.com> wrote:
Thanks guys
Would you say its efflorescence from commode Stu. What moisture readers do you guys use. 
Thanks again

Sent from my iPhone

On Aug 17, 2017, at 4:25 PM, Stuart Rosen <mail@stoneshine.com> wrote:

Justin
Its moisture from the commode-probably leaking.
Test it with a moisture so you can show them

On Thu, Aug 17, 2017 at 7:13 PM, <justin@jmcstoneandtilecare.com> wrote:
Hey guys, I've attached a couple of pictures one of my clients sent me (last pic is what the grout is supposed to look like). Anyone have any idea what could make the grout turn white? This is a janitorial company and the customer thinks bleach was used on the grout but the company doesn't use bleach. Let me know what you think.

Thank you,
Justin Cameron
JMC Stone and Tile Care
951-972-6997

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Regards,
Stu Rosen
201-446-1200