I have seen pin holes in this type of grout.
This lets water in. I had to heat removal a floor 2 years ago in a shower floor what a pain in the butt.
We installed  non sanded grout. For the tight grout joint this fixed the problem. I don’t know if this fix will fix the problem.
Hector Castillo

-----Original Message-----
From: sccpartners@stoneandtilepros.simplelists.com [mailto:sccpartners@stoneandtilepros.simplelists.com] On Behalf Of csantospago@gmail.com
Sent: Thursday, March 8, 2018 6:34 AM
To: sccpartners@stoneandtilepros.simplelists.com
Subject: Re: Dolomite tile shower with epoxy grout

The grout was Laticrete spectra-lock epoxy grout bright white.  I did not do the installation but I know that’s what they used

Sent from my iPhone

> On Mar 8, 2018, at 9:29 AM, hector castillo <hectorcastillo@comcast.net> wrote:
>
> Please show a photo of  the grout that was used.
> Hector Castillo
>
> -----Original Message-----
> From: sccpartners@stoneandtilepros.simplelists.com
> [mailto:sccpartners@stoneandtilepros.simplelists.com] On Behalf Of
> csantospago@gmail.com
> Sent: Thursday, March 8, 2018 5:59 AM
> To: Sccpartners Email Support
> <sccpartners@stoneandtilepros.simplelists.com>
> Subject: Dolomite tile shower with epoxy grout
>
> Partners,
>
> Got called to this job about a month ago to resolve the staining issue
> in this steam shower. I tried using a poultice with TSP and another
> section I used 40 volume peroxide cream.
> Both products worked but the peroxide cream was much quicker and
> easier to use. Also the poultice left the area stained for more than a
> week while the cream dried up within a day.
> Over a few weeks we did about 3 to 4 Applications removing all the
> staining and then we sealed everything with an impregnating sealer from M3.
> I just got a text from the homeowner and the staining has reappeared.
> I know that dolomite is a very sensitive material and probably should
> not be used in a shower setting. Not sure if the epoxy grout is the problem.
> Any thoughts from anybody?
> Thank you,
> Chris Santospago
> Restoration by design stone
>
>
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