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The Spindrifter Bottom Drain |
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The Spindrifter Bottom Drain |
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The membrane and backing plate of the Spindrifter bottom drain fit into a recess in the specially manufactured dome (provided). The recess in the dome prevents the membrane from becoming detached. The complete assembly is secured to the bottom drain by means of a stem, which also provides the air inlet. Most water pipe sizes can be accommodated. The air inlet is via a nickel plated connector.
All constructional materials uPVC, self tapping screws stainless. All welds triple run, suitable for concrete/fiberglass pond or liner.
The Spindrifter utilize
the TAS (Thatcher Advisory Services) aerator system that has been proved in
advanced aerobic waste water treatment over the last five years. It has now been
specially adapted to serve the needs of the fish enthusiast and when used in
conjunction with balanced feed regimes, can promote rapid growth in specimen
fish.
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Operation Each aerator consists essentially of a rubber membrane and backing plate. The EDPM rubber membrane has a diameter of (10 in). It clips over a Polypropylene backing plate where it is retained and sealed by an integrally molded 'O' ring. When air is initially applied to the membrane no bubbles are observed, but the membrane is seen to inflate slightly. As this inflation increases, bubbles can be seen to exit the 4500 slits of graduated width (Patents Pending). The slits are positioned in concentric circles ensuring an even distribution of bubbles over the surface of the membrane. Material stuck or resting on the surface of the membrane tends to be dislodged by the stretching of the surface of the aerator membrane when it is inflated. This stretching also discourages the attachment of microbiological growth. When air is shut off, the aerator membrane deflates causing the slits to be closed before all the air is exhausted from the aerator. This prevents the backflow of water, clogging and internal fouling. A centrally molded plug additionally seals the air supply hole. |
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Performance Tests carried out by Thames Water (ref. Muir PD576, 1997) demonstrated Standard Oxygen Transfer Efficiencies in excess of 6% per meter of depth (Oxygen to Water). This is significantly higher than other aerators. The pressure required to push the air through the slits in the membrane is 20mbar at the recommended flow rate. (20mbar is equivalent to 0.6ft of water and is extremely low) |
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The recommended air flow for a Koi Pond is 20 liters/min/meter of water depth per aerator for minimum oxygen transfer to the water. The aerator promotes water circulation as shown in diagram opposite. Using a pond aerator, dead areas of the pond may be removed. Using an Aerated Dome or a conversion kit will promote water circulation into the bottom drain, thereby improving removal of solids from the pond bottom. Reliability |
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