Pond Filter
Evolution Aqua Ltd. Nexus 220+
Model: 220+
A combined mechanical (Eazy) and moving‑bed biological (K+Media) pond filter for larger garden ponds, rated to 18,000 litres and a maximum flow of 10,000 L/h.
About Evolution Aqua Ltd. Nexus 220+
The Evolution Aqua Nexus 220+ is a purpose-built, passive filter body that combines a stainless‑steel Eazy mechanical stage (with static K1 Micro) and a moving‑bed biological outer chamber loaded with K+Media. The manufacturer states the unit is suitable for general pond use up to 18,000 litres and the Nexus 220+ is supplied “auto‑ready” for the Nexus Automatic Cleaning System (sold separately). Key verified physical facts: the filter contains 18 L of K1 Micro in the inner Eazy chamber and 50 L of K+Media in the outer moving‑bed chamber (the outer chamber accepts up to 150 L). The total internal water volume of the unit is 510 litres (inner 105 L + outer 405 L), and Evolution Aqua warns the Nexus 220+ weighs in excess of 510 kg when operating and full of water. The top/footprint and vertical dimensions are shown on the official dimension drawing (not all drawing labels are repeated here); the drawing lists an overall top width of 1,260 mm and other labelled heights for installation reference. Operational notes from the manufacturer: the Nexus 220+ has a stated maximum permitted flow to the filter of 10,000 L/h, with a recommended operational flow of 6,000 L/h for the 220+ model. The manual instructs that the pump should deliver to the filter a maximum of 10,000 L/h or achieve a turnover of the whole pond every 2–3 hours, whichever is greater. Where Evolution Aqua does not state a value on the Nexus 220+ product pages or manual, this record leaves those fields null (for example, maximum head in metres, electrical power consumption, UV wattage and cable lengths).
Best for
Owners of larger garden ponds seeking a combined mechanical and moving‑bed biological filter for ponds up to 18,000 litres; systems where an auto‑cleaning upgrade is desired.
Things to consider
Manufacturer documentation does not state a maximum head (m) for the Nexus 220+. The Nexus 220+ is a passive filter body; Evolution Aqua do not publish a power/wattage, cable length, UV/UVC wattage, operating pressure, IP rating, liner material or separate fish/koi capacities for this exact model on the official product page or manual. Manufacturer product code is not stated in the supplied sources.
Installation
Must be installed on a solid, level base minimum 1.2 m × 1.0 m; a 100 mm concrete plinth is recommended. Incorrect or unlevel bases can cause irreparable damage and may invalidate the warranty. For gravity-fed installations the Nexus water level must be the same as the pond; the manual references a plinth position 735 mm below finished water level for gravity setups. Use 4" pipe for the main return/bottom drain as shown in the manual; hosetail assembly and 1½" pump hose are provided/recommended for pump-fed setups. Do not exceed 10,000 L/h supplied to the filter.
Maintenance
The unit includes a large 1½" waste/discharge valve for cleaning cycles; the Nexus is supplied auto‑ready for the Nexus Automatic Cleaning System (sold separately) which can automate cleaning. Maintain and install the filter in accordance with the manual to preserve warranty. Inner Eazy mechanical stage contains 18 L K1 Micro; outer moving-bed contains 50 L K+Media (outer chamber can accept up to 150 L if altered).
Safety
The filter weighs in excess of 510 kg when full; ensure a suitably strong, level base and consider a plinth as recommended. Failure to follow base/installation guidance may cause irreparable damage and may void warranty. Electrical items referenced in the manual (air pumps, evoUV, automated kit) are separate products with their own specifications and safety instructions.