Nexus EAZY 220 Titanium Pond Filter – 4,800 Gallon Koi Pond Filter with Mechanical & Biological Filtration

The Evolution Aqua Nexus EAZY 220 Titanium (SKU: NEXUS220TIUS) is a professional-grade, all-in-one koi pond filtration system for ponds up to 18,000 litres (4,800 US gallons). It integrates three stages of filtration — mechanical, biological, and UV clarification — in a single cylindrical unit: no separate UV housing to plumb, no secondary chambers to position. Two built-in 36-watt Titanium-Enhanced UV clarifiers are integrated directly into the clean-water outlet for optimal photocatalytic performance. The EAZY 220 Titanium is the newest-generation Nexus, upgraded with K+Media in the moving bed biological chamber (replacing K1 Media) and supplied "auto ready" with factory-fitted fixings for the Evolution Aqua Nexus Automatic Cleaning System (sold separately). The filter uses the proven Nexus dual-media approach: 18 litres of K1 Micro® in the static EAZY mechanical stage, and 50 litres of K+Media in the aerated moving bed biological stage. 18,000L / 4,800 US Gal Dual 36W Titanium UV K1 Micro EAZY Mechanical K+Media Moving Bed Biological 2,640 US GPH Max Flow Auto-Ready Evolution Aqua NEXUS220TIUS Air Pump Required — Not Included How the Three-Stage Filtration Process Works Stage 1 Vortex Settlement Pond water enters the inner chamber and rotates, allowing heavy solids to settle at the bottom before reaching the EAZY filter. → Stage 2 — Mechanical EAZY K1 Micro® Static Bed Water passes through the stainless steel EAZY vessel (18L K1 Micro). Fine particles are captured in the static media bed. Water exits mechanically clean. → Stage 3 — Biological K+Media Moving Bed (MBBR) Clean water enters the aerated outer chamber (50L K+Media). Beneficial bacteria on K+Media convert ammonia and nitrite to harmless nitrate. → Stage 4 — UV Dual 36W Titanium UV Clarified water passes through 2× built-in 36W titanium-enhanced UV units in the exit chamber, eliminating green water algae before returning to the pond. The Titanium UV advantage: In the standard Nexus 220+, UV is not integrated — you must add a separate external UV unit and additional plumbing. In the 220 Titanium, the 2×36W titanium-enhanced UV clarifiers are built directly into the clean-water outlet chamber, achieving optimal hydraulic performance with zero additional plumbing complexity. Technical Specifications — Nexus EAZY 220 Titanium Specification Detail SKU NEXUS220TIUS Manufacturer Evolution Aqua (Wigan, UK) Max Pond Size 18,000 litres / 4,800 US gallons / 4,000 Imperial gallons Max Flow Rate 10,000 lph / 2,640 US GPH / 2,200 Imperial GPH — slower is better for clarity; aim for pond turnover every 2–3 hours UV Clarifiers 2 × 36-Watt Titanium-Enhanced UV units — integrated into exit chamber; no external UV plumbing required Mechanical Stage EAZY stainless steel vessel with 18 litres K1 Micro® static bed — fixed volume; do not add more Biological Stage 50 litres K+Media supplied (moving bed); expandable to 150 litres maximum outer chamber capacity Air Pump REQUIRED — not included. Minimum: Evolution Aqua Air Pump 75 (50–75L media load). See FAQ for sizing table. Total Water Volume 510 litres / 135 US gallons (inner chamber ~105L; outer chamber ~405L) Inlet Connection 4" EazyConnector Outlet Connection 4"-to-2" EazyConnector (pump-fed configuration as supplied) Waste Valve (EAZY cleaning) 1½" ball valve — inner chamber Drain Valve (outer chamber) ¾" ball valve Supply Configuration Supplied configured for pump-fed installation. Gravity-fed requires removing outlet standpipe and additional modifications — see installation instructions. Installation Base Minimum solid, level base: 1.2m × 1m (approx. 40" × 48"). Non-compliance causes irreparable damage and voids warranty. Auto-Ready Yes — factory-fitted fixings for Nexus Automatic Cleaning System (sold separately) Filtration Type 3-stage: Mechanical (K1 Micro static EAZY) + Biological (K+Media MBBR) + UV (dual 36W titanium) Warranty 1 year manufacturer's warranty (voided if installation base requirement is not met) ⚠ Air Pump Required — Not Included: The Nexus EAZY 220 Titanium requires an external air pump to operate the K+Media moving bed biological chamber. Without an air pump, biological filtration does not function. Minimum required: Evolution Aqua Air Pump 75 (for the standard 50L K+Media supply). See the FAQ below for air pump sizing guidance, or call us at (765) 508-4352. ⚠ Installation Base Requirement: The Nexus 220 Titanium MUST be installed on a solid, level base of minimum 1.2m × 1m (approximately 40" × 48"). Failure to install on a proper base causes irreparable damage to the filter and voids the manufacturer warranty. Nexus EAZY Range — Choosing Your Model Nexus EAZY 220 Titanium ← (This Product) Up to 18,000L / 4,800 US gal 2×36W Titanium UV built-in 18L K1 Micro EAZY + 50L K+Media (to 150L) Max 2,640 US GPH SKU: NEXUS220TIUS Nexus EAZY 220 (Standard) Up to 18,000L / 4,800 US gal No integrated UV — add separately 18L K1 Micro EAZY + K+Media bio chamber Max 2,640 US GPH Lower price point The 220 Titanium is the right choice when you want UV clarification without the complexity and cost of a separate external UV unit and additional plumbing runs. The 220 Standard suits installations where UV is already in the system or where separate UV sizing is preferred. Why the Evolution Aqua Nexus EAZY 220 Titanium? Integrated dual 36W Titanium UV — zero external UV plumbing. The two UV units sit inside the clean-water exit chamber, after all mechanical and biological stages. Clean, biologically treated water passes through the UV contact zone before returning to the pond. This is the optimal UV position — treating only clean water, not particulate-laden raw pond water that would reduce UV penetration. No external UV housing, no T-pieces, no unions to add. K1 Micro® EAZY — the world's most replicated mechanical pond filter design. The EAZY is a removable stainless steel vessel containing 18 litres of K1 Micro in a static bed. Water is forced through the K1 Micro from all directions simultaneously. Fine particles — fish waste, pollen, algae fragments — are captured in the bed. The EAZY can be cleaned with air without removing it from the Nexus and without getting your hands in the media. The clear lid allows visual inspection of the K1 Micro condition at any time. K+Media moving bed biological chamber — an upgrade over K1 Media. The Titanium series uses Evolution Aqua's K+Media in the aerated outer chamber. K+Media retains K1 Media's protected surface area at its core, and adds an outer layer of cells and fins that create "quiet zones" — microhabitats where Rotifers and Vorticella (higher-order filter-feeders) can establish. These organisms provide additional biological filtration not possible with standard K1 Media, accelerate the nitrification cycle, and improve long-term biological stability. EAZY cleaning without removing media or getting hands dirty. Using the air valves and ball valves on the Nexus, the EAZY is cleaned by diverting air to the inner chamber, which suspends captured waste. The suspended waste is then discharged through the 1.5" waste ball valve to a drain. The entire process takes minutes and requires no media removal, no siphoning, and no manual handling of solids. Auto-ready for the Nexus Automatic Cleaning System. The 220 Titanium is supplied with factory-fitted fixings that make it compatible with the Evolution Aqua Nexus Automatic Cleaning System (sold separately). This system automates the ball valve operations and air switching that make up the cleaning cycle — replacing the manual process entirely. The auto-ready design means there's no retrofit work required to add automation later. Pump-fed or gravity-fed flexibility. The 220 Titanium ships configured for pump-fed installation. Gravity-fed setups require removing the outlet standpipe and a few plumbing adjustments — detailed in the included installation instructions. Both configurations deliver full filter performance. Frequently Asked Questions What air pump do I need, and why is it required? An external air pump is required to operate the K+Media moving bed biological chamber. Without aeration, the K+Media in the outer chamber does not fluidize — it sits static on the bottom and provides dramatically reduced biological filtration. The air pump creates the continuous turbulence that keeps the media suspended, maximizing contact between water and the bacteria-colonized surface area of every K+Media piece. Evolution Aqua's recommended air pump sizing based on K+Media volume: 50–75 litres of K+Media: Evolution Aqua Air Pump 75 (minimum for standard 50L supply) 75–100 litres: Air Pump 95 100–150 litres: Air Pump 130 If you add additional K+Media to increase biological capacity, you must also upgrade to the appropriate air pump for the new volume. Contact us at (765) 508-4352 to order the correct Evolution Aqua air pump alongside your filter. What is the maximum pond capacity for the Nexus 220 Titanium? The Nexus EAZY 220 Titanium is rated for ponds up to 18,000 litres / 4,800 US gallons / 4,000 Imperial gallons. This rating assumes a moderately stocked koi pond with standard feeding rates. For heavily stocked ponds or high feed rates, Evolution Aqua recommends adding additional K+Media (up to 150 litres maximum in the outer chamber, with the appropriate larger air pump) to increase biological capacity. For turnover rate: aim to pass the full pond volume through the filter every 2–3 hours. The maximum flow rate is 10,000 lph (2,640 US GPH). Slower flow rates generally deliver better mechanical filtration efficiency from the EAZY. What is the difference between K1 Micro and K+Media in this filter? The 220 Titanium uses two different Evolution Aqua filter media for different purposes: K1 Micro® — in the EAZY (inner chamber), static bed, 18 litres: A small-diameter mechanical and biological media with 1,400m² surface area per m³. In the EAZY it operates as a static bed — not moving — to mechanically capture fine particles, pollen, and fish waste that the vortex settlement did not remove. Do not add more K1 Micro to the EAZY; the 18L volume is optimized for the EAZY's cleaning cycle. K+Media — in the outer chamber, moving bed (MBBR), 50L supplied: An evolution of K1 Media with additional outer cells and fins that create protected "quiet zones" for Rotifers and Vorticella. These higher organisms provide additional biological filtration beyond what bacteria alone deliver. The outer chamber is aerated — the air pump keeps K+Media in constant motion. Expandable to 150L maximum. K1 Micro = mechanical, static, fixed volume. K+Media = biological, moving, expandable. They are different products serving different functions in the same filter body. Can this filter run on gravity-fed or pump-fed setups? Yes — both are supported, but the Nexus 220 Titanium ships configured for pump-fed installation. Pump-fed: Your circulation pump sits in the pond and pushes water into the Nexus inlet. Filtered water returns to the pond by gravity via the outlet. This is the factory default configuration — no modifications needed. Gravity-fed: Water flows from the pond by gravity into the Nexus inlet (often via a bottom drain). Your pump sits in the outlet/exit chamber and returns filtered water to the pond. Requires removing the outlet standpipe and making additional plumbing adjustments. Carefully read the gravity-fed installation instructions included with the unit. Both configurations deliver full filter performance. Gravity-fed installations are common with bottom drain pond designs. How is the EAZY cleaned, and how often? The EAZY cleaning process is one of the Nexus's defining advantages — it requires no manual handling of the media and no pond shutdown: Insert the cleaning pipe into the centre of the EAZY. Water level in the inner chamber begins to rise. Divert the air supply from the outer chamber to the EAZY by switching the air valves. This agitates the K1 Micro and suspends captured waste. Open the 1.5" waste ball valve. Suspended waste discharges to drain. Close the waste valve, redirect air to the outer chamber, remove the cleaning pipe. Cleaning frequency depends on fish load and feeding rate. The clear EAZY lid allows visual inspection at any time — if the K1 Micro looks visibly loaded with waste, it's time to clean. Most users clean weekly under normal stocking conditions. The Nexus Automatic Cleaning System (sold separately) automates this entire process. What does "auto ready" mean on the 220 Titanium? The Nexus EAZY 220 Titanium is supplied with factory-fitted mounting fixings and fittings already in place for the Evolution Aqua Nexus Automatic Cleaning System — a system that automates the ball valve operations and air-switching that make up the manual cleaning cycle. When you add the Automatic Cleaning System, you simply connect the actuators and controller to the existing fixings — no drilling, no retrofit fabrication. The Automatic Cleaning System is sold separately. Contact us at (765) 508-4352 to add it to your order. How do the built-in Titanium UV clarifiers differ from a standard external UV? Standard Nexus 220+ filters require a separate external UV unit — typically a dedicated UV housing plumbed in-line with additional unions, T-pieces, and bypass valves. The Titanium integrates the UV directly into the exit chamber of the filter body, after all mechanical and biological stages. This positioning is optimal: UV light acts only on clean, particle-free water, maximizing penetration depth and kill efficiency. Particulate matter in raw pond water absorbs and scatters UV energy, greatly reducing performance in pre-filtration UV installations. The "Titanium-Enhanced" designation refers to the UV lamp sleeve material. Titanium dioxide-coated UV sleeves provide a photocatalytic reaction that generates hydroxyl radicals in addition to standard UV exposure, enhancing overall clarification performance beyond UV wavelength alone. What pumps are recommended with the Nexus 220 Titanium? Evolution Aqua's own Varipump range is an ideal match — controllable output lets you dial the flow rate to the filter's optimal 2,640 US GPH maximum without overpowering the EAZY mechanical stage. Slower flow rates through the EAZY produce finer mechanical filtration. The Varipump's variable output also lets you reduce flow during EAZY cleaning cycles. Any quality external or submersible pond pump sized for 500–2,640 US GPH is compatible. Avoid exceeding the 10,000 lph / 2,640 GPH maximum flow — higher rates reduce EAZY efficiency. Call us to discuss pump sizing for your specific pond setup: (765) 508-4352. Why Buy From Pond Pro Direct? Evolution Aqua product specialists — we can help you size the correct filter, air pump, and circulation pump for your specific pond volume, fish load, and feeding regime. Full Evolution Aqua range available — Nexus 220 Titanium (this filter), Nexus 220 Standard, Varipump, EazyPod, Cetus Sieve, Nexus Automatic Cleaning System. Call us to build a complete system: (765) 508-4352. Price Match Guarantee — found a lower authorized dealer price? We'll beat it by $50 on orders over $2,000. 30-Day Return Period. Call or text (765) 508-4352, Monday–Friday, 9 AM–5 PM EST. The Evolution Aqua Nexus EAZY 220 Titanium delivers professional-grade three-stage filtration for ponds up to 4,800 US gallons: 18L K1 Micro® EAZY mechanical, 50L K+Media moving bed biological (expandable to 150L), and dual 36W titanium-enhanced UV — all in one unit, with no external UV plumbing. Supplied pump-fed, auto-ready for the Nexus Automatic Cleaning System. 1-year manufacturer's warranty. Air pump required separately. Need help selecting an air pump, circulation pump, or building a complete Evolution Aqua system? Call or text (765) 508-4352 — Monday through Friday, 9 AM to 5 PM EST.