Introduc�on to the HPPG Series
The High Pressure PolyGeyser®(HPPG) blter series is the newest addon to Aquaculture Systems
Technologies’ line of bead lters. Patented ( U.S. Patent #9,227,863 Patent Pending , European
Patent #0977713B & Canadian Patent #2,287,191) fully exploits the biolm protecon provided by our
Enhanced Nitricaon (EN) Bead Media in a durable berglass hull. Designed as “bioclaris” capable
of performing both biological and mechanicalaon, PolyGeyser®Bead Filters are capable of handling
biological loads 50% to 100% higher than our Bubble Bead or Propeller Bead Filters equipped with
standard bead media. Addionally, the PolyGeyser®Bead Filters are virtually immune to clogging and
caking, since they are backwashed pneumly at a high frequency. These High Pressure PolyGeyser®
(HPPG) Bead Filters recycle their own backwash waters. The HPPG lters are the bioclari of choice
for commercial aquaculture and wastewater applicaons dealing with high organic loads.
Opera�on
The PolyGeyser®Bead Filter stands apart from AST’s other Bead Filter technologies primarily through its
automneuma backwash mechanism. Water is introduced below the bed of packed EN bead
media and travels upward through the ltraon chamber where mechanical and biologicalltraon
takes place. Simultaneously, air is slowly introduced into the air charge chamber at a constant,
predetermined rate to achieve the desired backwash frequency. Once the charge chamber has reached
capacity, the pneumac trigger res, releasing the entrained air from the charge chamber below the
media bed. The sudden release of air from the charge chamber causes the beads to mix, roll and “drop”
as the air agitates the beads.
The circulaon pump/airlioperates connually, which ensures that ther chamber begins relling
immediately aer each backwash event. This causes the beads to oat upward and reform as a bed.
During the recharge cycle (a few hours), suspended solids in the trapped backwash waters sele into the
sludge storage chamber for later disposal via the sludge drain valve (usually every 3 days- 1 week). At
the same me, the claried backwash waters are passed slowly through the bead bed again eliminng
any backwash water losses.
The eliminaon of water loss associated with backwashing is a key element in this new technology. In
most applicaons, dozens of backwash sequences can be automly executed before sludge removal
is required. There is no water loss associated with the backwash process and the water loss associated
with sludge drainage is negligible. This strategy is paularly advantageous for marine systems, where
the loss of saltwater must be minimized.
