Charles Austen ET100 Twin-Zone Large Pond Aeration Kit

Charles Austen ET100 Twin-Zone Large Pond Aeration Kit

A balanced two-zone system that shares 100 L/min between two single-disc diffuser stations.

This complete system combines a land-mounted linear air pump, self-sinking diffuser stations, weighted airline, flow control and the secure fittings needed for a properly planned large-pond or lake installation. It is best suited to large ornamental or stocked ponds needing two well-separated aeration zones.

Why this layout works

• Two separate rising-water columns improve circulation across a long pond or two distinct areas.
• The nominal 50 L/min per DSW1 sits in the preferred working range for each diffuser disc.
• The ET100 is a quieter, efficient choice where a larger ET200 system would be unnecessary.

What is included

• 1 x Charles Austen ET100 air pump
• 2 x DSW1 single-disc diffuser stations
• 1 x 2-way manifold with 18mm inlet and 14mm valved outlets
• 2 x 15m lengths cut from one 30m reel
• Correctly sized connectors, reducers, stainless steel hose clips and installation guidance

Airflow, pond size and depth guide

Every pond is different. These figures are deliberately described as screening guidance, not guaranteed maximum coverage. Actual airflow is affected by diffuser depth, airline length, fittings, pond shape, water temperature, fish load and the purpose of the aeration. Stocked-pond figures use an initial 3–6 L/min per 1,000 litres approach before system losses; lake area figures assume a reasonably regular water body with light-to-moderate loading and sensible diffuser placement.

Diffused aeration supports oxygen transfer and moves water vertically, but it does not replace adequate filtration and it is not, by itself, a guaranteed algae treatment.

Choose the airline length

Standard: 2 x 15m lengths cut from one 30m reel. Choose the extended option for 2 x 30m lengths (60m total). The product selector prices the extra weighted airline and any required straight joiners automatically.

The super-heavy airline has a nominal 12.5mm (1/2-inch) internal diameter. Its flexible bore fits securely over the specified 14mm or 1/2-inch barbed outlets. Every connection must be secured with the supplied stainless steel hose clip. For runs outside the listed options, add extra 30m weighted airline or ask us to calculate the most efficient layout.

Installation and safe start-up

• Position the air pump on a firm, dry, ventilated base above the water level, or use a correctly rated non-return arrangement where this is impossible.
• Use an outdoor electrical supply protected by a 30mA RCD and keep electrical connections out of the water.
• Keep manifold and trunk connections full-bore; avoid unnecessary reductions that create back pressure.
• Place diffuser stations level and use the valves to balance visible bubble output. Never lift a diffuser by its airline.
• In an older, stagnant or strongly stratified pond or lake, introduce bottom aeration gradually. Rapidly mixing poor-quality deep water through the whole water column can temporarily reduce oxygen and stress fish.
• Clean diffuser membranes and inspect airline, clips and pump filters regularly. Service the pump with the correct diaphragm and filter kit.

Compare the complete aeration kit range

See the Large Pond & Lake Aeration Kits guide, or compare another layout:

• ET120 Twin-Zone – 2 x DSW1 single-disc diffuser stations
• ET200 Central DSW4 – 1 x DSW4 four-disc diffuser station
• ET200 Twin DSW2 – 2 x DSW2 twin-disc diffuser stations
• ET200 Four-Zone DSW1 – 4 x DSW1 single-disc diffuser stations
• ET250 Central DSW4 – 1 x DSW4 four-disc diffuser station
• ET400 Twin DSW4 – 2 x DSW4 four-disc diffuser stations
• ET400 Four DSW2 – 4 x DSW2 twin-disc diffuser stations
• ET500 Twin DSW4 – 2 x DSW4 four-disc diffuser stations
• ET500 Four DSW2 – 4 x DSW2 twin-disc diffuser stations

Free suitability check before you order

Send us the pond’s length and width, average and maximum depth, approximate volume, fish type and stocking level, distance from the pump to each diffuser position, and whether the main goal is fish oxygen support, circulation, de-stratification or emergency aeration. We will check the pump, diffuser count and airline layout before dispatch.