I have a pool in my backyard surrounded by a standard pool deck, along with a stamped concrete patio. Portions of the deck and patio were settling differently resulting in upwards of 3 inchs between the two surfaces (which i was frequently kicking and tripping over). I called a couple of local companies for estimates and they were not quite ready for the season so I called Poly-Mor Canada (who work out of Toronto and will come to Ottawa when they have several jobs to do). Poly-Mor uses a lightweight polymer resin does not add an additional weight to the property so should help stabilize future settling (or so they say). I believe this is much more expensive than the traditional concrete raising approach, but I decided to go with Poly-Mor because of their 10 year warranty - if there is any further settling, i will be looked after. The work was done very efficiently by a team who are very proud of their work and the company. The results were great and given all these factors, i would recommend Poly-Mor for similar work.