Using With Hydroponics: The Round 5 Inch Air Stone Disc Is A Great Way To Oxygenate Your Hydroponic Growing System And Or Tropical Fish. Provides A Continuous Ring Of Bubbles To Help Aerate Your System. The Micro-Pore Design Energizes Your Growing Solution As It Aerates And Circulates Your Nutrients. It Will Extend The Life Of Your Nutrient Solutions. Helps To Keep Your Roots Healthy And Promotes Exceptional Growth. Using With Tropical Fish Aquariums: The Deluxe 5 Inch Round Air Stone / Disk Allows You To Create A Beautiful Ring Of Bubbles That Will Add To Your Decor While Helping To Aerate Your Aquarium. Made Of A Durable Porous Material Each Air Stone Can Be Connected To Your Air Pump And Tubing (Not Included) Using The Standard Tubing To Provide An Endless Stream Of Bubbles. The Deluxe 5 Inch Air Stone Can Be Set At Any Angle In Your Tank And Can Be Buried Without Fear Of Clogging. Available In Three Different Sizes Including 3" 4" And 5" Diameters.