I did Purina for a few years through the local Co-Op, my contact person was very helpful. When he left the next guy didn't care enough for me to buy 40 bags a year from him. I Switched to Cargill Triton 4512 last year, very pleased. Starting 6 Sweeney feeders up Friday. We feed from April fools day to Halloween...For fry starter I just put some regular size in a blender.