I owned a property about 6 years ago and we had the posigrip company come out and treat an area around our pool that was so slippery that our dogs couldn't stand up straight whenever it was wet.
We lived in the house for 4 years and didn't know that a company like this existed. We were ready to replace the tile and when we called the company that installed the tile they told us about posigrip and so we were able to fix the problem. I give posigrip a thumbs up for price and quality.