Yes! I use it in my hydro system and there is dead space between the pot and the water where the roots get a build up. I could NOT figure out what that was!! Thank you!! It has never caused a problem with bad roots or anything but that was driving me crazy! I find I also have to stir my rez fairly often cause it seems to settle in the bottom. I love what it does for my plants tho and will continue to use it. Wow, you just made my day!