Drain Smart 9" Disc 2-pack The discs are a convenient, clean and easy way to drain your pots. Keep your deck or surface clean as the Drain Smart discs stop soil or dirt from migrating out of the pot. No more need for messy and bulky gravel, bark or packing peanuts. Simply trim disc to size and place in your pot then fill with soil and plant that's it! Use the discs to promote healthier, stronger plants as Drain Smart's proprietary technology helps to prevent root rot through improved drainage.