Difference between Mudjacking and Polyurethane Concrete Raising. Also called foam lifting, polyurethane for concrete raising has been in practice for about 20 years. However, the price of the equipment and polyurethane material made it way too expensive for private contractors to adopt and replace traditional mudjacking.
Farmed salmon available in Washington state markets is produced in Washington State, Canada, Maine, or Chile. Studies on salmon from these sources have shown low levels of organic contaminants in the fish.
From what I've read, this doesn't discuss directly the main reasons for Monterey Bay Aquarium's Avoid rating for farmed salmon: === One of the biggest concerns is the amount of food required to raise farmed salmon. It generally takes three pounds of wild fish to grow one pound of farmed salmon.