Hey not that I want to get into the discussion about AN vs Dyna Gro, but back to the subject of the thread, I read somewhere from the Dyna Gro website that chunks in the bottle are likely pottasium fallen out of solution. I searched for the link to attach here but cannot find it now, sorry. The recommened remedy was to shake it back into solution, and I know some people have heated it and that worked so... just saying. And I remember from high school chemistry that you can dissolve more in a warm solution than cold so maybe Sonar can try and warm the solution then shake, that might help....