I have a ~1500 sq ft patio with pavers and about 50 linear feet of a sitting wall in the same stone, plus a fire ring. All untreated. After a few years, the algae growth looked terrible. Not to mention dangerous because it would get slippery when wet. Made an appointment with Rhettro Pressure Washing to get an estimate on cleaning and sealing. Rhett showed up exactly when he said he would. He seemed very knowledgeable and explained in detail about the cleaning and sealing process. Was quite pleasant and friendly to talk to. Provided a written estimate as an attached pdf via email. Once I accepted, he provided a written response acknowledging, and a follow-up emailing noting the agreed upon scheduled work date and time. Again, showed up exactly when scheduled and did a great job as you can see from the before and after pictures. After paying the invoice, I received a receipt showing paid in full. I bring up the communication aspect of my interaction with Rhett because I have found that when a contractor is very responsive/communicative via email/text interactions, they tend to be very conscientious in their work. Good communications ... good work! Highly recommended.