Travertine floor tiles

[altile]

I have 40sqm of filled & honed 400sq to lay on a solid base of ceramic (not too glossy) tiles over concrete (part of which has existing ufh). I have been recommended both bal rapidset flexible and normal rapidset with Admix AD1.
Can anyone advise, and also if the Admix option, what ratio do you use?
Thanks in advance.......

 

[GazTech]

Bal rapid flex is appropriate,no need for ad1 at all

 

[DHTiling]

totally agree with gaz, flexi-rapid set and super-flex floor grout ( bal )
dave......

 

[altile]

Thanks again Dave, and Gaz. Dave, glass tiles all up and grouted. Even girlfriend says they look fantastic, which is praise indeed. Let you know how the floor goes.
Cheers.
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Any suggestions best product to prep existing floor tile base, leaving it squeaky clean?

 

[DHTiling]

use sugar soap to shift all that grime etc...