PondMAX SubAir EPDM rubber Disc Diffuser 10Quad Membrane Pond Aeration 03PA426

PondMax SubAIR EPDM Disc Diffusers are ideal diffusers for aerating water bodies with low oxygen levels, Stratification due to exposure to direct sunlight, and Algae bloom or sludge build up. These diffusers are placed at the bottom of the pond and are supplied with air by a shore mounted compressor.  Disc Diffusers are commonly used in demanding Wastewater treatments plants, Aquaculture and Fish Ponds that require 24 × 7 operation.  
Features:

Fine bubble disc diffusers are the ideal option to maximise oxygen density in high efficiency applications.
Low maintenance EPDM rubber Disk diffusers with thousands of micro pores to ensure uniform supply of small air bubbles through the water column for consistent aeration.
Integrated check valve
Hollow base can be filled with sand or gravel.
Includes Inlet air fitting and strain release clam.
Promotes health of aquatic life and inhibits Algae bloom by distributing oxygen rich water from the surface to the deeper parts of the pond and mixing cooler water at the bottom of the pond with the warmer layer at the top.
Prevents mosquito breeding in ponds by circulating and agitating the surface water.

Specifications:

Membrane Material: EPDM rubber
Number of disc membranes: 4
Disc Diameter (per disc): 10 inch (25.5 cm)
Inlet connection: Compatible with 3/8”, ½”, 5/8” tubing
Recommended Air flow: 112 L/min – 280 L/min
Warranty: 1 year

Applications:

Recreational and fishing ponds
Lakes and lagoons
Golf course ponds
Irrigation ponds

Recommendations:

We recommend care in handling and storage to prevent tearing, puncturing, or fouling of the rubber membranes. If units are to be stored before installation, it is recommended to utilise the original unopened shipping cartons.
If you note a large volume of air in a localised area, this could potentially indicate damaged diffuser membrane.
The shape of the pond affects the number of diffusers needed. Irregular shaped ponds often require multiple diffusers to adequately aerate the entire water column.

What are the top reasons for the need for a Pond Aeration system?

Aeration is the process of circulation of oxygen rich air within the water body. Dissolved Oxygen (DO) is the lifeblood of any Aquatic Ecosystems and is the most crucial element of water quality management.

Preventing Stratification: As the sun warms the surface of the water, it causes the temperature difference between the surface and deeper waters. Stratification is formation of ‘layers’ of water (water column) with different temperature within a water body. Aeration forces mixing of cooler water at the bottom of the pond with the warmer layer at the top, thus creating vertical circulation between the pond bottom and the surface.
Ensure uniform Oxygen level: Lack of movement or mixing of water cuts off the oxygen exchange between atmosphere and bottom parts of the water body. Aeration creates an upward water movement to distribute oxygen rich water from the surface to the deeper parts of the pond, promoting health of aquatic life and inhibiting Algae bloom.
Encourage growth of beneficial bacteria: Not aerating the pond will prevent water movement and can lead to stagnation, which is harmful to pond life. Aeration helps to keep the pond clean by promoting the growth of the healthy bacteria that remove nitrates and ammonia. In the case of Hydroponics where the plants are grown in a nutrient rich water without soil, aeration is crucial to ensure efficient nutrient circulation. While in the case of a sewage water treatment, aeration is done to provide growth of aerobic bacteria as they consume waste materials like human waste, food waste etc.
Prevent Sludge build-up, Algae bloom and Aquatic weed: Lack or inadequate level of Oxygen prevents beneficial bacteria from breaking down organic waste. The absence of Oxygen also kills the bottom dwelling animals (snails, mussels, worms, etc.) that help to keep a pond clean, and causes the nutrients accumulated on the bottom surface of the pond to form a layer of muck which serves as fertiliser for weeds and algae.
Odor and Phosphorus reduction: Uneaten fish food coupled with exposure to direct sunlight causes increase in levels of soluble Phosphorus in the pond water on which Algae depend on. Putrid odour indicates stagnation of water and algae bloom.
Elimination of Fish kill: Accumulation of solids from fish waste or uneaten fish food will result in denitrification, which will cause ammonia concentrations to spike, causing fish getting killed overnight. Oxygen depletion also causes the fish to swim near the surface gulping air. During warmer stretch of days, this could result in fish kill due to higher temperature.
Deterring Mosquito breeding and other diseases associated with Stagnant Water: While pond aeration and water flow are not a method to directly kill mosquitoes or larvae, it’s a great way to prevent them in the first place. Mosquitoes are always looking for stagnant waters instead of moving water, so a pond with good water flow can help prevent mosquitoes.

What are the advantages of Pond aeration by Fine bubble diffusion?
Studies have shown that if a certain volume of air is divided into large bubbles, while an equal volume of air is divided into small bubbles, the smaller bubbles will enable a greater transfer ratio of oxygen into the water. This is so because the smaller bubbles will contain the same volume of air in a greater number of air bubbles, thus maximising the surface area. This increased surface area increases the residence time of each bubble in the water, allowing a better Oxygen Transfer Rate (OTR). Studies have revealed that twice as much air can be transferred from the same air volume using fine bubbles as could occur using coarse bubbles.