BubbleMac Aeration Products HYDROPONIC/WATER GARDENS BUBBLE STONE - Deep Water Culture Diffuser; model#00141; 100% Glass-Bonded Silica Medium Pore Air Diffuser {Self-Weighted Design} This Bubblemac Aeration Products Design Is IDEAL FOR HYDROPONICS. The Diffuser Boasts A Whopping 36 Square Inches Of Bubble Area. {Top, Bottom and Sides.} *Produces A Uniform Medium Size Bubble 1-3 MM* Bubblemac Air Diffusers Increase Surface Agitation, Accelerate Oxygen Replenishment and Help Remove Harmful Carbon Dioxide. Your Plants Will Love This Air Stone! *Remember: Aeration Helps Increase Beneficial Bacteria* Bubblemac Air Diffusers Have Long Been Considered "The Standard Of The Industry" by Fish Hatcheries, College Labs and Lake Doctors Worldwide. NOW AVAILABLE in a Hydroponics / Aquaponics Application. Air Diffuser Measures 3" x 3" x 1.5" and Comes With A Standard 1/4" OD Air Connection Barb. {Suggested 0.7 CFM or 18-20 lpm} -- "Made Locally / Used Globally" -- Specs: 100% Glass-Bonded Silica, Maximum Pore Size 140 Microns, Nominal Partical Retention 50 Microns, Flexural Strength 2500 PSI, Bubble Size 1-3 MM, UNLIMITED LIFETIME When Used In pH 8.0 Or Less. This air diffuser should not need to be cleaned for one full year. When cleaning is necessary, simply bath in a diluted solution of Muriatic Acid {swimming pool acid}. This will restore the air diffuser to "Like New Performance." Constructed of High-Quality 100% Glass-Bonded Silica our Air Diffusers are Warranteed for Two Full Years. Efficient, Effective, Affordable and Durable. If You Have Tried The BLUE IMPORTS and watched as they disappear over time? Try One Of Our Bubblemac Air Diffusers Today. See The Difference in Performance our American Made Products Bring To The Market! If You Are Not 100% Satisfied With The Product, Return It For A FULL REFUND. No Questions Asked!