Sure To Grow insert Squares are easy to use, and with no need to condition or pre-clean, they are ready to use right out of the box. Sized to fit square pots and buckets, and are compatible with all major growing systems and methods such as: Flood and Drain, Aeroponics, Top drip, DWC, Raft and Fogponics.Sure To Grow products are designed to benefit growers and users by using a unique substrate and a technology designed for the 21st century. Sure To Grow is lighter, cleaner, and much less bulky than any other medium currently on the market. You will find that with Sure To Grow, less is truly more.