One summer we had a stone patio installed in our backyard, our driveway bordered with stone, and our front porch steps redone. DOMTA provided great advice, and the workmanship was fantastic. We were very happy with the design that they suggested.
2 summers later we started noticing that the 'grout' between all the stones in our backyard patio had seeped out and was easily scraped away like sand. it was soft all between the stones. The grout between the stones that outlined the patio were fine and hard. We emailed DOMTA for some ideas how to fix it but we never heard back. It seemed like the sand was never hardended, or the wrong sand was used. But the rest of the work done around the front of our house and the edges were fine.
The same summer, we had some landscaping done around our house and we had the landscapers fix the grout of the patio for a small price. I wished we had noticed the problem sooner, and had contacted DOMTA within the same year the patio was installed.