ABI Sediment Blocks

ABI Sediment Blocks are a group of soil-specific, slow dissolving and slow releasing blocks containing blends of water treatment components and anionic polyacrylamide. ABI Sediment Blocks are used for water clarification, erosion control, and phosphorus removal.



1 ABI Sediment Block
(treats 1 - 3 acre-feet)
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1 ABI Sediment Block
(treats up to 10,000 gallons of water)

Place Online Order

Each block is designed to treat 1-1.2 million gallons of water by removing dissolved metals, phosphorus, and nutrients from the water column; thus reducing the nutrients that cause excess weed and algae growth. There are more than 80 different ABI Sediment Blocks, each tailored for a specific soil and/or water chemistry application to provide optimum performance over a one to two month time span depending on water flow at the application site. (Minature sediment blocks are availabe for smaller bodies of water such as koi ponds).

Before and After Application - Waterfall

 before sediment block     after sediment block

ABI Sediment Blocks should be placed where the turbid, cloudy or otherwise dirty water will flow over them; over aeration system diffusers, in a natural or artificially created stream or waterfall that flows into a pond or lake, or at the intake or outlet of a recirculation system. Aquatic Biologists, Inc. will help you customize the use of the Blocks into your existing pond system to ensure optimum performance.

ABI Sediment Blocks bind colloidal clays together and other suspended sediments that can discolor a pond. The sediment is bound into larger particulates that will settle out of the water column quickly and resist re-suspension.

Water may begin clearing within a few hours to a few days - especially with an effective aeration system. To expedite the process; particle curtains, filters, and sediment blocks may also be used to collect inflowing particulates before they enter a lake or pond. The time period involved to obtain desired results depends on the size of the pond, water depth, specific water chemistry, flow rate, and application rate of the blocks. If the pond is small, it may begin to clear after only a few turnover cycles . If the pond or lake is very large with a slow turnover rate, it may take many turnover cycles before the water becomes clearer. The type of clays and other suspended material in the water can also affect how quickly the particles can form and drop out of suspension.

Placement and Directions for Use

Aeration Systems

sediment block aerator


An aerator or bubbler system creates water movement over and around each ABI Sediment Blocks enabling the polymer blend to dissolve and disperse throughout the water body. ABI Sediment Blocks is tied to a float which keeps the block in line with the upward bubble movement and off the pond bottom. The float also conveniently marks the location of the system in the pond. Multiple ABI Sediment Blocks may be added.


Floating Fountain

sediment block fountain

Floating fountains are esthetically pleasing plus they can serve as an excellent source of agitation when APS 800 Series Pond Logs are needed in the system. Two purposes can easily be served as well as working to clarify the systems water and keep nutrient levels low. The diagram below shows how APS 800 Series Pond Logs work with floating fountains. 

Place each ABI Sediment Block immediately beneath the floating fountain. The intake from the floating fountain creates a flow of water over and around the ABI Sediment Block creating the necessary mixing required to dissolve and distribute the block's components. The ABI Sediment Block must be in the flow of water and that the fountain should be placed in an area of the pond that provides even distribution for best performance.


 sediment block steps  sediment block waterfall

An ABI Sediment Block placed in the flow of a waterfall or rapids system dissolves and mixes well with the down-slope or down gradient movement. For best results, place the ABI Sediment Block(s) near the top of the grade, in the flow of water, to maximize mixing and reaction. Varying flow rates/velocities and quantities of suspended abrasive solids (such as sand) will create variability in the dissolution rate. ABI Sediment Blocks comes with ropes at each end to secure and prevent it from falling down the steps of the waterfall with the movement of water.

ABI Sediment Blocks do not contain aluminum or sulfates. All ABI Sediment Blocks meet ANSI/NSF Standard 60 Drinking Water Treatment Chemical Additive classification. Extensive toxicity testing has been conducted on each type of ABI Sediment Block, following EPA test protocol and ASTM guidelines to ensure they are non-toxic and safe to use anywhere. The high performance standard and lack of toxicity allows ABI Sediment Blocks to be used in areas of ecological sensitivity.

Precautions / Limitations 

  • ABI Sediment Blocks are extremely slippery when wet.
  • Spills should be cleaned up quickly using a dry cloth to minimize spreading of the slippery polymer.
  • ABI Sediment Blocks will remain viable for up to 5 years.
  • ABI Sediment Blocks are soil and water specific. Testing must be done to determine the correct site specific Pond Log. For more information, contact Aquatic Biologists, Inc.