Polygeyser Bead Filter

The AST Polygeyser Bead filter is AST’s patented line of beadfilters featuring a breakthrough in filter technology: automatic pneumatic backwash for hands-off maintenance and low water loss. Learn more about our unique PolyGeyser filters below, or contact the AST team and we will help you choose the perfect PolyGeyser for your application.


AST Polygeyser Bead filter – How it Works

The PolyGeyser filter is a breakthrough in filter technology. It is very different from most filters on the market due to its auto-pneumatic backwash mechanism. Water enters below the bed of enhanced nitrification media and travels upward through the filtration chamber where mechanical and biological filtration take place. Simultaneously, air is introduced into the charge chamber at a constant predetermined rate to achieve the desired backwash frequency.

Once the charge chamber has reached capacity, the pneumatic trigger fires, releasing the entrained air from the charge chamber below the bead bed. The sudden release of air from the charge chamber causes the beads to mix as the air agitates the beads. As the beads drop, the bead bed expands downward while simultaneously water rushes downward through the expanded beads, sweeping the solids away and into the air charge chamber.

In the chamber, the solids settle out from the backwash waters and are later removed from the filter. Essentially, this type of filter recycles the backwash water while concentrating the waste products so that you have extremely low water loss while maximizing the nitrification capacity.

Frequent backwashing has proven advantageous for optimizing the nitrification capacity of a PolyGeyser filters. Numerous gentle scrubbing cycles promotes a higher rate of nitrification by maintaining a healthy thin biofilm on the surface of the bead media. Typical backwash cycles occur every 3-6 hours.’

PolyGeyser® Bead Filters are the newest addition to Aquaculture Systems Technologies’ line of Bead Filter Technologies. The patented PolyGeyser® Bead Filters (U.S. Patent # 5,770,080 and 6,517,724, European Patent # 0977713B, and Canadian Patent # 2,287,191) utilize the same filtration mechanism as all of our bead filters namely water from the aquatic system passes upward through the packed bed of plastic beads. The beads capture the solids, while simultaneously providing a large surface area (400 ft2 /ft3 ) for the attachment of nitrifying bacteria which remove dissolved nitrogenous wastes. Bead filters are excellent clarification units, capable of maintaining display quality water at high waste loading rates. Studies have shown that Bead Filters capture 100% of particles > 50 microns and 48% of particles in the 5-10 micron range per pass.

Under development for several years, the PolyGeyser technology exploits the biofilm protection provided by our Enhanced Nitrification (EN) Bead Media. Additionally, the PolyGeyser® Bead Filters offer a very high degree of reliability and are virtually resistant to clogging and caking by virtue of the fact that they backwash automatically using no moving\ parts or electronics. As a “bioclarifiers” the PolyGeyser® are capable of handling ammonia loads 50 to 100 percent higher than standard bead filters, at a fraction of the water loss and head loss!

PG Polygeyser


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Recirculating Polygeyser (wastewater)