Control of Phosphorus with
Alum/Sodium Aluminate

Alum controls the internal loading of phosphorus from the bottom of the lake. The alum forms a layer of aluminum hydroxide precipitate on the bottom which blocks phosphorus release from the sediments. In acid sensitive waters, sodium aluminate is applied simultaneously with the alum to maintain a neutral pH during treatment.

The distribution of materials is controlled by a patented process using the computer pictured below. The computer continually monitors the water depth and boat speed and automatically adjusts the valves to deliver a precise dose of materials to the water. Applications can be made by water volume, by area, or a combination of the two. The alum can either be applied to the surface or injected below the surface to treat the hypolimnion.

A computerized satellite navigational system guides the operator back and forth across the lake in parallel paths. This guarantees accurate no-skip, no-overlap coverage and eliminates the need to drop and retrieve buoys to mark the paths.

Up to 50,000 gallons or 11 tank trucks of material can be applied per day.

FLEXIBLE:

Treats by surface area and/or by water volume

Treats epilimnion and/or hypolimnion

Handles one or two materials simultaneously

Applications can be tailored to meet unique needs

Slurries dry powders for application

Launches on unimproved sites

EFFICIENT:

Two man operation

Fills from tank truck or pneumatic bulk truck

Carries 25,000 pounds per trip

Applies 35,000 to 50,000 gallons per day

Treats 60 foot path width at speeds up to 7 mph

Treats on the surface or up to 15 feet below the surface

PRECISE:

Patented computer controlled application

          maintains dose accuracy within 5%

DGPS satellite guidance system insures

            total coverage

Note: Equipment and process are protected under

U.S. patents 4,747,958, 4,818,416, 4,877,524,

4,882,072, and 5,089,120. Canadian patents pending.