Koi Pond Aerator/Aquaponics / Hydroponics {Synergistic Diffuser Manifold, Deicer - Airlift System - manufactured by Bubblemac Industries, Inc. - 100% Glass-Bonded Silica Medium Pore Air Diffusers Perfect for Koi Ponds where you suspect a problem with dissolved oxygen. This Bubblemac airlift system "BREAKS" stratification by introducing vertical currents. -- Bubblemac Aeration Products Provide An Effective, Yet "Unique" Alternative To The Import Blue Stones... Diffused air systems will add oxygen, eliminate "dead" spots and keep your fish active and healthy by reducing stress. Also helps prevent "ice-over" in freezing temps. **NO MATTER what the cause of low oxygen in your pond, adding diffused oxygen to the water column is the permanent solution! Increase Water Circulation; Prevent Stagnant Stratified Water; and Reduce Muck... This Bubblemac system is designed to provide oxygen for up to 50 pounds of fish and circulate water in ponds of up to 4000 gallons. ** Also very functional as a Deicer Unit; Adding Life-Sustaining Oxygen, while Removing Toxic Gases which are Harmful to your Fish and Eco-System. ** Comes complete with four Bubblemac Air Diffusers {1" x 1" x 3" w/ 1/4" NPT} ** Three Standard Air Line Connection Barbs {3/16", 1/4", and 3/8"} ** {Suggested CFM = 1.2 or 33-35 lpm}, Made in the U.S.A., SELF-WEIGHTED SYSTEM. Made Locally; Used Globally! **Our Aerator System Provides The Highest Oxygen Transfer Efficiency. EFFICIENT, DURABLE, AFFORDABLE and EASY TO MAINTAIN.** SPECS: 100% Glass-Bonded Silica, Maximum Pore Size 140 Microns, Nominal Partical Retention 50 Microns, Flexural Strength 2500 PSI, UNLIMITED LIFETIME When Used in pH of 8.0 or Less!