Koi Pond Bubbler/Aquaponics / Hydroponics -Deicer manufactured by Bubblemac Industries, Inc. Medium Pore Air Diffusers- Self-Weighted Design -Model #0403 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 Water, and Reduce Muck. Thereby restoring A healthy, balanced pond eco-system. **Reminisent of the original Aeration / Destratification Systems in use for the past 30 years, Bubblemac Industries, Inc. "reintroduces" an economical synergistic airlift manifold system.** {Suggested CFM = 1.4 or 38-42 lpm} SELF-WEIGHTED SYSTEM. Quite Unique, There Is Nothing Else Even Close On The Market! -- Sold complete with four Bubblemac Air Diffusers {1.5" x 1.5" x 3" w/ 1/4" NPT}, these systems have proven to be the lowest cost method of increasing circulation and adding oxygen. ** {Three Air Line Connection Barbs Included 3/16", 1/4" and 3/8"} ** PERFECT FOR KOI PONDS / FISH PONDS where you suspect a dissolved oxygen problem. Our manifold systems "BREAK" stratification by introducing vertical currents. This Bubblemac system is designed to provide oxygen for up to 100 pounds of fish and circulate water in ponds up to 8000 gallons. ** Also very functional as a Deicer unit in freezing temperatures; Adding Life-Sustaining Oxygen while Removing Toxic Gases which are Harmful to your Fish and Eco-System. ** Diffused Air Systems add oxygen, create circulation and eliminate "Dead Spots." Our System provides the Highest Oxygen Transfer Efficiency...UNLIKE the one-piece import models which are produced for pennies and sold to the consumer for big $$, this unit is modeled after THOSE successfully used in the aquaponics industry for the past 35 years. EFFICIENT, DURABLE, AFFORDABLE and EASY TO MAINTAIN! Our Systems Keep Your Fish Active and Healthy By Reducing Stress. Also helps prevent "ice-over" in freezing temps. Made in the U.S.A. "Ya'll Got Bubbles"? - SPECS: 100% Glass-Bonded Silica, Maximum Pore Size 140 Microns, Nominal Partical Retention 50 Microns, Flexural Strength 2500PSI, Bubble Size 1-3 MM, UNLIMITED LIFETIME When Used in pH of 8.0 or Less!