I ordered 5 pounds..(50 bucks plus shipping) I couldn't affor 10 which is what the guy said it would take to do the whole 55..so I am going to do the pools and waterfall and filters with it and what ever if any left just gonna make rock like areas..and do the rest with silicone and EE. I was curious if anyone has used the mortar? I may need some help haha or some sort of direction of how to make it look like rock one I get it. I also need adive on coloring..I am not sure if I keep it the same color or if I add to it? I hope I can get this to look great! I think it will look good with the different two looked (rock and EE) background if I can pull it off. I am getting the expanding foam this weekend..and going to try and get started soon. I am nervous about doing it by myself =) but the pools worked nicely..they are at least watertight! Ps I will post pics of the pools with the waterfall. I want to know which sie I should place the waterfall..for best effects and use!