Pond Filter
Evolution Aqua Nexus 320+
Model: Nexus 320+
A passive combined mechanical + moving‑bed biological pond filter with a manufacturer‑stated maximum flow of 13,000 L/h and a maximum general pond capacity of 34,000 litres.
About Evolution Aqua Nexus 320+
The Evolution Aqua Nexus 320+ is a passive external pond filter that combines a stainless‑steel mechanical chamber (the “Eazy”) with a moving‑bed biological chamber. Evolution Aqua supply the unit with 20 L of K1 Micro for the inner mechanical/Eazy stage and 100 L of K+Media in the outer moving‑bed chamber (the outer chamber can accept up to 300 L K+Media). The manufacturer states a maximum feed flow of 13,000 L/h and gives a recommended pond turnover of every 2–3 hours as guidance for ideal performance. Evolution Aqua list the Nexus 320+ general pond capacity as 34,000 litres and show the filter holds a total internal water volume of 840 litres when operating. Because the Nexus 320+ is a passive filter body it has no electrical rating or integrated UV — electrical accessories (air pumps, evoUV clarifiers, etc.) are separate products and are not specified on the Nexus documentation. The manual includes connector and hose guidance (pump‑fed inlet recommended with 1½" hose, return via a 4" return pipe or EazyConnector arrangements) and specifies waste/drain valve sizes for maintenance: the Eazy inner chamber waste valve is 1½" and the outer chamber maintenance/drain valve is ¾". The unit is supplied “auto‑ready” with pre‑drilled fixings to accept the Evolution Aqua Nexus Automatic cleaning upgrade kit. Evolution Aqua state the filter weighs in excess of 840 kg when full of water; no dry weight is provided in the Nexus documentation.
Best for
Owners of large garden ponds requiring combined mechanical and moving‑bed biological filtration for ponds up to 34,000 L; pump‑fed or gravity‑fed installations (per connector guidance).
Things to consider
Evolution Aqua documentation for the Nexus 320+ does not provide a maximum head value or pump performance curve (only a maximum feed flow of 13,000 L/h). The filter body is passive and has no electrical power rating, integrated UV or power cable; specifications for recommended accessories (air pumps, evoUV) are on their separate product pages. Manufacturer does not publish separate fish or koi/heavy‑stock pond capacity figures. The manual includes a dimension diagram with labelled measurements; if you require each labelled dimension transcribed, request the exact mapping.
Installation
Do not exceed the manufacturer maximum feed flow of 13,000 L/h. For pump‑fed installations the manual recommends 1½" hose to the hosetail; return pipework uses a 4" return or EazyConnector arrangements. Fit airline (12 mm) and appropriate air pump according to media volume; the unit is pre‑drilled to accept the Nexus Automatic cleaning upgrade. Be prepared for the installed filter to weigh in excess of 840 kg when full of water and ensure a suitable base.
Maintenance
The Nexus 320+ has dedicated waste/drain valves for flushing the inner (Eazy) and outer chambers; routine maintenance is via these valves and by servicing the Eazy mechanical stage and moving‑bed media. Evolution Aqua offer an Automatic cleaning upgrade which can reduce manual cleaning. The manufacturer manual does not specify maintenance intervals.
Safety
The unit is extremely heavy when filled (>840 kg) — ensure a suitably prepared, level base and safe handling during installation. The filter body contains no electrical components; any powered accessories (air pumps, UV clarifiers) must be installed and operated in accordance with their own manuals and safety instructions. Use the correct connectors and hose sizes listed in the manual to avoid leaks.