Dark grey grout gone white patchy ? Efflorescence ? - TilersForums.com

[GaryVenters]

Please help, do you reckon its efflorescence in my grout lines ? Will I have to dig out and re-grout ? or is there a quick way to resolve ?

 

[jay]

how olds your grout is it internal or external and whats the substrate under tiles pics would help

 

[GaryVenters]

Bathroom floor was grouted Sunday, substrate is 22mm plywood, used bal grey flex addy. Grout is Ardex FS grout 4mm grout lines

 

[Gazzer]

Quick fix is Aquamix grout colourant.
Tradetiler Aqua MIx Grout Colorant

 

[Dan]

There are more cases of Efflorescence reported on this forum down to BAL grouts than any other manufacturer. A BAL rep told me once it was due to the type of sand they use in their mix, or something along those lines.

 

[DHTiling]

Ardex grout.. It is more than likely Polymer/latex leaching from the washing off process... scrub the joints with a scotch pad and a solution of LTP grimex... This should sort it..

I doubt it is Efflorescence , as this is a white powder formation and not just a whitish effect..

Try the cleaning part and report back once dry..