AST provided three custom 450 ft³ Propeller-Washed Bead Filters for the Mora NFH. These units were designed to provide nitrification for the coldwater research facilty at Mora.

AST provided one custom Model PBF-50 Special. This unit was designed to provide both biofiltration and solids capture on a system used for propagation of the four endangered Colorado River fish: razorback sucker, Colorado pikeminnow, bonytail, and humpbacked chub.

AST beat out several competitors for the right to provide a "Seawater Table" to the Science Department at the WSU Vancouver. The system was designed so that multiple small tanks could be set in the upper tray, each tank would receive filtered, chilled and sterilized water. The tanks would then overflow water into the upper tray, flow via gravity to the 120 gallon sump tank under the table where the water would be picked-up and pumped (via a Sequence 750 saltwater centrifugal pump) through three 24" carbon/floss filters, a 3/4 Hp Aqualogic in-line chiller with titanium chiller barrel and digital thermostat. Finally after passing through the chiller the water is pumped through an Emperor Aquatics 40 watt UV sterilizer before being returned to the top of the table.

Additionally, a small protein skimmer with its own was installed on the sump tank where it recirculates at 5 gpm. The main tray sat on a stainless steel stand, the equipment under the stand was mounted on a Carson equipment pad and finally a maple wood cabinet enclosed three sides of the system.
 

AST designed a "Build a Bait" shrimp holding system for a tackle shop in Ft. Lauderdale, FL. The system was designed to hold up to 100 lbs of bait shrimp. The holding tank was constructed by Rowland Fiberglass, it was 60" x 60" x 18" deep with a hinged lid. Biofiltration and solids capture was accomplished by a two cubic foot bubble-washed bead filter (Model BBF-2). A 1.0 Hp Aqualogic in-line chiller with titanium chiller barrel and digital thermostat provided cooling, and a 1/4 Hp Sequence 1000 saltwater pumped was used for circulation. Water is pump from the rotationally molded polyethylene sump tank manufactured by Polytank, through the bead filter, and finally the chiller before being returned to the holding tank. A small Sweetwater linear air pump and air stones provide aeration to the tank.

 

AST recently delivered three quarantine holding systems to Rainforest Cafe. Working with the curators of several Rainforest Cafe restaurants, a compact, economic design was settle upon. Each system consists of two 200 gallon rotationally molded circular PolyTanks, a 1/4 ft³ Bubble-Washed Bead Filter, a Precision Marine Protein Skimmer and a Rainbow Lifeguard Carbon Filter. Two Danner Mag pumps provide water circulation. A Mag 9.5 pump is dedicated to circulating water through the protein skimmer at 7 gpm and a Mag 12 pump is used to circulate water through both the bead filter and carbon filter at 10 gpm. The filtration equipment is mounted on a raised plastic equipment pad and the pumps are mounted off-the-floor under the equipment pad.

AST recently delivered three custom Model PBF-100 Propeller-Washed Bead Filters to the Japanese Friendship Garden in Phoenix, AZ. The units will were sized to provide complete biofiltration and solids capture for the 500,000+ gallon Koi pond which is going to be the center piece of the garden.

In 1996 AST constructed the first Model PBF-100, one hundred cubic foot Propeller-Washed Bead Filter for the LA Department of Wildlife and Fisheries new Booker Fowler Fish Hatchery. The construction presented a unique challenge in that the filter building had already been constructed and the filter had to be shortened considerably to fit into the building, without reducing the filter volume. We finally settled on using a right angle gear box and mounting the mixing motor horizontally.

This unit was developed as part of our DOC SBIR Phase II Research Grant entitled "Development of an Extremely Low Water Loss Floating Bead Filter for Biofiltration and Solids Capture on Recirculating Marine Aquaculture Systems". The unit is shown here installed on an intensive indoor shrimp facility in Corpus Christi, TX.