over the years, I've put them right in, and soaked them, and didn't really see a difference in the long run... I've been pretty much exclusively been using 10 inch air bars, but have some set ups, that placement makes the hob filters, suck up bubbles, causing more filter noise, so I've bought another pack of 4 inch by 2 inch cylinders, like I use in my tilapia out side tanks... I never presoaked those, but see they recommend that???
- Easy to Use: Soak the stone completely in water for 1 hour before use.