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.
But, when produced under responsible circumstances, farmed salmon can be a low-cost, sustainably sourced alternative to wild-caught salmon. Whether you should buy farmed salmon or not really comes down to where you're buying the stuff and how strict their sourcing standards are. While government-mandated regulations are relatively loose, higher-end grocery stores have self-imposed aquaculture guidelines and regulations.