Lake/Pond Aeration Underlay Manifold/Pond Deicer -model# LAM-02- {two diffusers} - manufactured by Bubblemac Industries, Inc. NO MATTER what the cause of low oxygen levels 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! This aerator will deliver the many benefits that result from sufficient bottom aeration and increased dissolved oxygen {DO} levels.** Also functions very well as a Pond Deicer! Our manifold system features two "Original" Bubblemac design 100% glass-bonded silica air diffusers {1.5" x 1.5" x 6" } Coupled with a 1/8" PVC underlay and a Brady check-valve. All PVC components {3/4"} are Schedule 40 and built to last. {Suggested 1.0 CFM or 28 lpm} Made in the USA, warranteed for one full year; this synergistic diffuser manifold design has proven to be effective in over 500,000 acres of lakes worldwide over the past 35 years. -- SEE FIRSTHAND THE BENEFITS OF EFFECTIVE AERATION!-- Underlay Specs: Approx. dimensions 12" x 21", weight 3.8 pounds, air line connection 1/2" ID tubing. -- Air Diffuser Specs: 100% Glass-Bonded Silica, Maximum Pore Size 140 Microns, Nominal Partical Retention 50 Microns, Flexural Strength 2500 PSI, Bubble Size 1-3 MM, SERVICE LIFE UNLIMITED when used in pH 8.0 or less. -- Self-Weighted Diffusers, Durable, Affordable and Easy To Maintain. *Healthy Ponds And Lakes Have The Proper Balance Of Oxygen And Nutrients To Sustain Plants, Fish and Other Living Organisms.