Newly tiled grout issue

Silvermane

New member
Oct 17, 2023
3
Oz
Hi all, my pool builder has just finished a conversion of our pool from pebblecrete to tiles.
The result is great except for one 'detail' that isn't a detail in my book. The grout between the porcelain mosaic tiles is cement colour grey which is a relatively light shade of grout.
For our coping we chose bluestone which has been grouted with dark grout. The grouting of the coping was done after the grouting of the rest of the pool had long been done.

I already had concerns, when the grouting was being done for the coping, that there was too much residue left behind on the pool tiles but the pool builder told me it would all work out and to leave everything alone as he doesn't like owners getting involved in his work and messing things up which I can understand.
However, on final delivery day when they did the big clean-up and handed over the keys so to speak, turns out the dark coping grout has effectively stuck to the lighter grout of the pool tiles as I had been afraid of...
This was their last working day before heading into the Christmas break so the earliest they can do something about this is after the holidays. Of course, we'd like to fill up the pool and actually use our pool during the break. Given that we hired the pool builder back in July with the express intent of getting the pool finished before the middle of November, I'm a bit annoyed at the moment to say the least.

So my questions are:
- Given that the cement colour grout between the pool tiles turns darker when wet anyway, will this problem go away/blend in (at least for the parts under water) or will it still be visible when you're in the pool that there's different shades of grout under water? Knowing this will at least allow me to determine whether I can already fill the pool up or not.
- He's suggested coming back after the break to put some light acid on the groutlines and give them a scrub for the ones above the waterline. Will I have to drain the pool to allow that to happen? Or is this something that can safely go into the water and that I just need to rebalance the chemicals of the water afterwards?
- Will the suggested solution even work? I mean it's not that the light cement grout is dirty. It's just received an additional layer of darker grout basically... My concern is that no amount of cleaning is gonna resolve this. Cleaning dark grout is basically still just going to result in clean, but still dark, grout... I'm afraid only a mechanical removal of the top layer of the grout where the dark grout has stuck is going to resolve this. Am I correct in thinking this?
I've actually just gone over a dark groutline with a bit of sandpaper and that seems to do the trick. Problem is that doing this is going to take forever so we'll definitely be in the pool for the holidays, just working our asses of on hands and feet for something that shouldn't have happened in the first place and not in any water with a cocktail in hand 😒
- Or could a viable alternative be to apply an additional 'coat' of the lighter cement colour grout over the dark one... Problem there I assume would be that if the groutline is full then you can't really add more.
- Additionally, the bluestone hasn't been sealed yet and the grout has only been applied to the groutlines, not the full tiles, so now the coping looks super streaky as well. He's told me, since I need to get a different guy to come and do the sealing (to which he's provided a contact), that that person will be able to fix that issue.... Not convinced that he will though unless if he grouts the entire tile which is something my wife was trying to avoid as she likes the lighter shade of bluestone.

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Hi and welcome to TFP. Sorry to be meeting this way. That tile is SO pretty! I love a tiled pool!

I hate that you cannot use your pool over the holiday. Has the PB said you cannot put water it for just now then drain it when they are ready to work on fixing THEIR mistake? That would be my plan of attack.
 
Thx for the warm welcome kimkats, been a long time lurker but finally felt the need to post given the circumstances.

No he's just said he'll be back after the holiday to try and fix it with a light acid wash and scrub but he's left it to me to decide whether I fill it or not without saying whether or not I will need to drain it partially or fully when he comes back. Don't think I'll be able to get a hold of him anymore given that he's on leave now so thought I'd ask here.

Thanks for liking the pool tile :D
We're really happy on our tile and coping selection and the design I did on the skimmer box etc, just this grout issue makes it look like it's a pool that's been in use for at least 5 years rather than just having been completely redone :(
 
How much does water cost in your area? If water is inexpensive I would fill the pool and enjoy it over the holidays. Then drain the pool, if necessary, for your contractor to fix his work when he is ready to do it.

I would not let a minor cosmetic problem of some dark grout keep you from enjoying your pool.

Fill it up. Add some stabilizer and chlorine. And go swim.

Happy Holidays!
 
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