Shower re-grouting question

[austin99]

I wasn't sure if I should post here or in the DIY forum...apologies if I got it wrong

I have a mosaic marble shower which after 7 years has started leaking. There are some small cracks in the grout around the drain

I put some silicon sealant in this area as a temporary measure and also to see where the leak was coming from - it's not the prettiest of jobs but the leak has stopped - so far so good.

So I guess I need to re-grout the area as a more permanent solution.
I believe I need to rake out the existing grout before putting in the new grout - is it ok to do this just in the area around the drain that I've highlighted in red here? Or do I need rake out in between the mosaic tiling which I'd really like to avoid doing?

Is there a specific type of grout that I should use? BAL easypoxy / BAL microflex / epoxy / regular ?

I don't know if it's worth mentioning but tanking was put in underneath the shower when it went but I have doubts about the quality of the work. Also there is a little bit of flex in the floor which I know is far from ideal.

Any advice is appreciated - thanks!

 

[Dave]

Grout alone will not cure it. If its leaking then the tanking has either failed or incorrectly done.

 

[austin99]

Grout alone will not cure it. If its leaking then the tanking has either failed or incorrectly done.

Thanks for the reply. I don't really want to tear all the tiling out to re-tank it......unless it's absolutely necessary.

Are there any other temporary or semi-permanent measures I could take apart from regularly reapplying the silicon sealant?
(there are only 2 adults in the house, so at least we can take care not to disturb the silicon sealant that is in place)