Maybe eight years ago or so we installed an inground pool and went with some beautiful looking Travertine stone for the patio area. It looked great and is cooler underfoot than the synthetic unlock paver stones, but it has begun to look like **** over the last few years. It was never sealed with anything I should add.
I've had it power washed at a fair expense because it takes forever with all the little seams where you can't dwell with the wand or the grout completely blows out. And it still needs a re-application of the swept in locking sand.
Even after all that it never looked like it did. Last year I didn't do anything about it, and this is what it looks like coming out of this winter. I need to get on this during the coronavirus lockdown and have it done before I open the pool in a 3 or 4 weeks from now.
Any ideas? I haven't wanted to spray chemicals but I'm getting over that reluctance. But I don't even know what to use if I did...