Hello all, I've searched the forum and have not found a specific answer to my question. I've been AG brewing for near two years now, and have regularly enjoyed mash efficiencies in the mid 80's. Lately my efficiencies are tanking; as low as 68%, more usually around 75%. No clue why. I use a mix of well water and R/O water for the mash. Have not checked my pH in a long time, so that may be a factor. I use a Barley Crusher, which is set the same as always. Do they get loose with time? I generally mash for up to two hours, and continually sparge by ladling. Sparge time is usually an hour +. I recently bought a bag of Canadian two row (Canada Malting Company), where I used Briess up until now. Any thoughts there? The spec tag was not attached. Thanks for any help, Steve.