The Hydro Flow® Rain Ring™ is a great solution for automating your garden. Its versatility allows you to effectively water soil as well as hydroponic growing media, without using small irrigation lines and drip stakes. The Rain Ring™ has several strategically positioned distribution holes to fully moisten your grow media. Its heavy duty construction allows them to be used indoors under HID lighting and in full sun outdoor applications. Soak and rinse between cycles for years of trouble free use.