CLEAN-FLO’s Engineered Solutions to Aeration

CLEAN-FLO’s approach to water body restoration is based on duplicating nature’s own design for keeping water bodies healthy and in balance. It is certainly no secret that dissolved oxygen is the cornerstone of maintaining water body health and balance.

Maintaining high dissolved oxygen levels throughout the water column from top-to-bottom (including the sediment/water boundary layer) twenty-four hours per day 365 days per year delivers the following benefits to the water body:

• Control of nutrients that lead to excessive aquatic weed and algae growth (P, N, and CO₂).
• Prevention of the formation of undesirable toxic gases, hydrogen sulfide, methane and ammonia, formed as a result of persistent anaerobic conditions.
• Prevention of the chemical release of Manganese, Iron and other metals through redox reactions under anaerobic conditions.
• Increase in biological activity in the benthic layer, accelerating the decomposition of organic “muck” at the bottom.
• Fishery improvement as a result of enabling fish to live and feed all the way to the bottom of the water body.

1 hour after the aeration system was turned on in a pond that was fully covered with ice

Given these well-established benefits, it would seem obvious that artificial aeration would be a wide-spread management tool for improving water quality in ponds, lakes, and reservoirs. Unfortunately, as simple as artificial aeration is in concept, the vast majority of artificial aeration projects fail to deliver results as expected.

CLEAN-FLO International has “closed the gap” between the theoretical benefits of artificial aeration and practical application in the field. Our design and implementation process has evolved over 40 years of successfully restoring water bodies from less than 1 acre to greater than 1,000 acres using our proprietary Inversion Oxygenation™ approach to artificial aeration.

The CLEAN-FLO Inversion Oxygenation System utilizes shore-based compressors to drive air to diffuser heads strategically placed on the bottom of the designated treatment area. Our proprietary Ceramic Diffusers produce a highly concentrated column of air bubbles of a diameter shown to deliver the highest oxygen transfer rate possible.

In conjunction with specified air compressors, our diffusers move 120,000 gallons of water per hour to the surface in six feet of water with the amount of water movement increasing exponentially with depth.

Through this method, we are able to achieve complete laminar flow in the designated treatment area ensuring complete mixing of the water column from surface to the water/sediment interface. Fully 99% of the oxygen transfer comes from the air/water interface at the surface versus direct transfer from the air bubbles into the water column. Therefore, the key measure of the effectiveness of any diffused aeration system is not how many bubbles are produced or how much air is injected into the water, but how much water is being moved to the surface by the technology.

Based on our on-going testing, CLEAN-FLO’s Inversion Oxygenation Systems achieve the highest oxygen-transfer per horsepower-hour in the industry. In other words, our designs are very efficient at lifting water from the bottom and creating complete laminar flow at the surface where the water is highly oxygenated before returning to the bottom. Our Inversion Oxygenation Systems achieve virtual uniformity in temperature and oxygen content from surface to bottom in the treatment area. Usually within 2 weeks or less after installation and start-up.

1. Custom Engineering and Design Capability – Every CLEAN-FLO System is custom engineered to meet the specific requirements of the customer and to ensure complete mixing of the target treatment area with maximum energy efficiency. We are not limited to a particular type or range of compressor configuration. In fact, we have the capability to utilize nearly an unlimited range of compressor sizes and configurations and have developed and implemented designs utilizing rotary vane, piston, rotary screw, rotary claw, and scroll compressors. Where necessary, we can design and install systems that utilize rigid PVC piping in combination with self-sinking rubber airline to cover larger acreage utilizing a single power location and ensuring maximum energy efficiency. This design capability and flexibility enables us to consistently offer system designs that deliver more oxygen transfer per horsepower-hour than other bottom-diffused aeration systems that rely on a “kit approach” to systems design.
2. CLEAN-FLO Ceramic Diffuser Technology – Our Ceramic Diffusers offer several advantages over membrane or perforated air-hose diffuser designs. Our technology is NOT comparable to the commonly used, outdated “air stone” designs that are often sold for backyard pond applications. We have developed a proprietary ceramic formulation and airflow system through the diffuser that delivers higher efficiency and more consistent performance over time than membrane diffusers. These diffusers will not to clog in open water environments and are very low maintenance.

Membrane diffusers widely touted as “state of the art” aeration technology are proven to stretch over-time resulting in larger than optimal bubble size and significant loss of efficiency. While the diffuser boil may look adequate at the surface, the larger bubbles from a stretched membrane diffuser lift significantly less water reducing oxygen transfer rates over time. For this reason, CLEAN-FLO abandoned membrane diffuser technology more than 10 years ago.

Example Comparison of the Superiority of CLEAN-FLO Ceramic Diffusers to Membrane Diffuser Technology

Upper Midwest Lake – Surface Area: 163 acres

As part of an open, competitive bid process, CLEAN-FLO submitted a design proposal along with one of the leading suppliers of systems using membrane diffuser technology. The following table provides a summary of the two competing designs.

Perforated airline diffuser systems cannot match CLEAN-FLO Ceramic Diffusers in terms of airflow per surface area resulting in lower oxygen transfer rates. In addition, perforated airline diffuser systems are prone to clogging often requiring hydrochloric acid injection or manually punching holes in the clogged holes which increases cost and maintenance.