I use a granular nutrient for my girls. I was a pioneer of theirs, one of their early customers. After 18 months they changed their formula and told me it was something better. Well when they announced they were ready to start shipping it I ordered a 20+lb bag. It comes in the mail and it was their old version and when I asked them about it I was told they had some of the old stuff to get rid of first. So when my 20lb bag is gone in 5 or 6 years I'll have to see what's out there that catches my fancy. The stuff I use works incredibly well and I love it but it's the principle of the thing.