Nexus EAZY 220 Pond Filter – 4,800 Gallon Koi Pond Filter with K+ Media Mechanical & Biological Filtration
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Description
The Evolution Aqua Nexus EAZY 220 is a professional-grade koi pond filtration system engineered for demanding ponds up to 4,800 gallons. It combines two distinct filtration stages in a single compact unit: a stainless-steel EAZY vessel containing 18 litres of K1 Micro static bed media for mechanical filtration, and an outer moving bed chamber with 50 litres of K+ Media for biological filtration (expandable to 150L). The filter is Auto-Ready fitted, flow-rate tested at 2,640 GPH, and backed by Evolution Aqua's 2-year warranty.
Filtration System Breakdown
Stage 1 — Mechanical (EAZY)
- Stainless steel EAZY vessel inside inner chamber
- 18 litres K1 Micro static bed media
- Inner chamber vortex settles heavy solids
- K1 Micro captures fine suspended particles
- Cleaned via air-diversion cycle (minutes, no scrubbing)
- Removable EAZY vessel for direct access
Stage 2 — Biological (Moving Bed)
- 50L K+ Media supplied (mineral-enriched surface)
- Expandable to 150L maximum K+ capacity
- MBBR: air keeps K+ Media in constant motion
- Aerobic bacteria colonize K+ for ammonia/nitrite removal
- Exit chamber returns treated water to pond via outlet
Installation Options
- Gravity-fed: pond water feeds filter by gravity via 4" bottom drain; pump returns filtered water to pond
- Pump-fed: pump supplies water to filter; filtered water returns to pond by gravity via waterfall or large pipe
- EazyConnectors on inlet and outlet accept 4" (110mm) pipe
- 4"-to-2" outlet reducer included for pump-fed return
Waste / Cleaning Connections
- 1.5" ball valve — inner chamber (EAZY cleaning waste)
- 3/4" ball valve — outer chamber drain
- Optional waste pipe kit available separately
- Air pump drives cleaning; no manual scrubbing
Technical Specifications
| Specification | Detail |
|---|---|
| SKU | NEXEAZ220 |
| Manufacturer | Evolution Aqua (UK) |
| Max Pond Size (Koi) | 4,800 US gallons |
| Max Pond Size (Non-Koi) | Up to ~9,000 gallons (lightly stocked/decorative) |
| Max Flow Rate | 2,640 GPH (10,000 LPH) |
| Dimensions | 49.6"L × 43.7"W × 33.5"H |
| Water Volume in Filter | 135 US gallons total |
| Inlet Connection | 4" (110mm) EazyConnector |
| Outlet Connection | 4" (110mm) EazyConnector (4"-to-2" reducer included for pump-fed) |
| Inner Chamber Waste Valve | 1.5" ball valve (EAZY cleaning) |
| Outer Chamber Drain | 3/4" ball valve |
| K1 Micro in EAZY | 18 litres (static bed, mechanical filtration) |
| K+ Media Supplied | 50 litres (moving bed, biological) |
| Max K+ Media Capacity | 150 litres (upgradeable) |
| Air Pump | Required — NOT included. Recommended: Evolution Aqua Air Pump 75 or larger |
| Lid | Optional accessory — not included standard |
| Auto-Ready | Yes — factory-fitted fixings for Nexus Automatic Cleaning System |
| Warranty | 2-year manufacturer warranty |
| Installation Base | Minimum 1.2m × 1.0m solid, level base required — non-compliance invalidates warranty |
| Color | White (standard) — also available in Titanium (NEXEAZ220TI) |
Nexus EAZY 220 vs. Nexus EAZY 220 Titanium
| Spec | NEXEAZ220 (White) | NEXEAZ220TI (Titanium) |
|---|---|---|
| This Product | White body — standard color | Titanium body — UV-stable, for exposed outdoor installs |
| Max Pond Size | 4,800 gallons | 4,800 gallons |
| Flow Rate | 2,640 GPH | 2,640 GPH |
| Media | 18L K1 Micro + 50L K+ (same) | 18L K1 Micro + 50L K+ (same) |
| Warranty | 2-year | 2-year |
| Ideal For | Filter pit, shed, or shaded installs | Exposed outdoor installs with high UV exposure |
Why the Evolution Aqua Nexus EAZY 220?
- Two-stage filtration in one unit — no separate drum filter or vortex chamber needed. The Nexus EAZY 220 combines what would traditionally require separate mechanical pre-filtration (vortex, drum filter, or settlement tank) and biological filtration (trickle filter, bog filter, or separate moving bed reactor) into a single vessel. Water enters, solids are captured by the inner vortex and then by the K1 Micro static bed in the EAZY, and the mechanically clean water passes immediately into the K+ Moving Bed biological chamber before returning to the pond. One connection to a bottom drain, one connection back to the pond. For koi keepers who don't want a multi-chamber filter room, this is the defining advantage.
- The EAZY cleaning cycle takes minutes and requires no manual scrubbing. To clean the EAZY mechanical stage, you divert the air supply from the outer K+ Moving Bed chamber to the inner EAZY vessel using the air valves. This agitates the K1 Micro media, releasing captured solids to the bottom of the inner chamber where they can be discharged through the 1.5" waste ball valve. The entire process takes under five minutes, can be done weekly, and requires no contact with filter media. Contrast this with foam filter blocks or bead filters that require physical removal, squeezing, or backwashing with pump disconnection.
- K+ Media's mineral-enriched surface accelerates filter maturation significantly. K+ Media (Evolution Aqua) features a unique mineral-enriched surface coating designed to accelerate the initial colonization of nitrifying bacteria — the slow step in establishing a new biological filter (typically 4–8 weeks for standard plastic media). The mineral surface provides a chemical affinity for Nitrosomonas and Nitrobacter that shortens the maturation window. For a new pond or post-maintenance restart, this is the practical difference between water that clears in weeks vs. months.
- Auto-Ready fitted — factory fixings for the Nexus Automatic Cleaning System. The EAZY 220 ships with the mounting points and fittings for the Nexus Automatic Cleaning System already installed at the factory. This means adding automation later is a simple accessory installation rather than a retrofit modification. The auto-cleaning system runs on a programmable timer and handles the entire cleaning sequence mechanically — ideal for koi keepers who travel or want reduced maintenance involvement.
- 150L maximum K+ capacity — 3× the supplied amount. The EAZY 220 ships with 50L of K+ Media but the outer chamber can accommodate up to 150L. Additional K+ Media can be added incrementally as fish load increases or as the biological demand of the pond grows. This means the filter can scale with the pond population without requiring a larger unit. At 150L, the EAZY 220's biological capacity approaches what would typically require a separate dedicated moving bed reactor.
Frequently Asked Questions
What is the maximum pond size for the Nexus EAZY 220?
The Nexus EAZY 220 is rated for koi ponds up to 4,800 US gallons. For decorative water gardens or ponds with very light or no fish stocking, the effective capacity extends to approximately 9,000 gallons. The 4,800-gallon rating assumes a moderately stocked koi pond — for heavily stocked ponds or large koi, we recommend sizing to the lower figure or adding additional K+ Media to the outer chamber (maximum 150L). Call us to size for your specific fish load: (765) 508-4352.
Does an air pump come with the Nexus EAZY 220?
No — an air pump is required but is NOT included. The Nexus EAZY 220 requires a continuous-duty air pump to operate the K+ Moving Bed outer chamber and to perform the EAZY mechanical cleaning cycle. Without an air pump the biological media will not fluidize and the cleaning function will not work. Evolution Aqua recommends the Evolution Aqua Air Pump 75 or larger for the EAZY 220. Add an air pump to your order or call us for a recommendation: (765) 508-4352.
What are the plumbing connections on the Nexus EAZY 220?
The Nexus EAZY 220 uses 4" (110mm) EazyConnectors on both the inlet and outlet. For gravity-fed installations, the inlet connects to a 4" bottom drain pipe; the outlet connects to the return pump. For pump-fed installations, the inlet connects to the pump; a 4"-to-2" outlet reducer (included) connects the filtered water return to the pond. Waste connections: 1.5" ball valve for inner chamber cleaning waste; 3/4" ball valve for outer chamber drain. Do not attempt to use 3.25" or 4.5" pipe — these sizes are not compatible with Evolution Aqua EazyConnectors.
Can the Nexus EAZY 220 be used gravity-fed or pump-fed?
Yes — the Nexus EAZY 220 supports both configurations. In a gravity-fed setup, pond water flows from a bottom drain into the filter by gravity; a return pump then pushes filtered water back to the pond (typically via a waterfall). In a pump-fed setup, a submersible or external pump pushes water into the filter; filtered water returns by gravity. Gravity-fed is generally preferred for koi ponds as it allows the use of larger diameter pipe (4") with less restriction and allows solids to settle before reaching the filter. The pump-fed configuration uses a smaller outlet fitting — the 4"-to-2" EazyConnector reducer is included for this purpose.
How does the EAZY cleaning process work, and how often is it needed?
The EAZY cleaning process is entirely air-driven and typically takes under five minutes. The process: (1) Turn off the circulation pump; (2) Insert the inlet slide plate; (3) Divert air from the outer K+ Moving Bed chamber to the inner EAZY vessel using the air valve — this agitates the K1 Micro static bed media and releases captured solids; (4) Open the 1.5" waste ball valve and discharge solids; (5) Restore air to the outer chamber; (6) Remove the inlet slide plate; (7) Restart the circulation pump. Frequency: typically weekly, though this depends on fish load and feeding rate. The process requires no manual contact with media and no tools.
What are the two types of media in the Nexus EAZY 220, and how do they differ?
The Nexus EAZY 220 uses two distinct Evolution Aqua media types for the two filtration stages:
- K1 Micro (18 litres) — in the stainless steel EAZY vessel (mechanical stage): A static bed of very fine wheel-shaped media with a protected inner surface. In the static EAZY configuration, K1 Micro captures suspended fine particles that pass through the inner chamber vortex, acting as a moving-bed media in a static context to remove solids from the water before the biological stage.
- K+ Media (50 litres supplied, 150L max) — in the outer moving bed chamber (biological stage): A larger, mineral-enriched surface media kept in constant motion by the air pump (MBBR — Moving Bed Biofilm Reactor). The motion ensures all surfaces of every K+ piece are continuously exposed to pond water and oxygen, allowing only the most efficient aerobic nitrifying bacteria to colonize. These bacteria convert ammonia (from fish waste) → nitrite → nitrate.
What installation base requirements apply to the Nexus EAZY 220?
The Nexus EAZY 220 must be installed on a solid, level base of at least 1.2m × 1.0m (approximately 48" × 40"). This requirement is specified in the Evolution Aqua installation manual: failure to install on a solid base will cause irreparable structural damage to the filter body and will invalidate the warranty. The most common installation locations are a concrete pad or compacted gravel base adjacent to the pond, a filter shed or equipment room with a reinforced concrete floor, or a filter pit (for partially buried/gravity-fed installs). Call us for installation planning advice: (765) 508-4352.
Why Buy From Pond Pro Direct?
- Authorized Evolution Aqua dealer — full 2-year manufacturer warranty applies to the NEXEAZ220.
- Full Evolution Aqua Nexus lineup — EAZY 220, EAZY 220 Titanium, EAZY 320, EazyPod, plus compatible air pumps and automation accessories. Call to compare: (765) 508-4352.
- Expert koi filtration consultation — we'll help you size the right filter for your pond volume and fish load, and advise on gravity-fed vs. pump-fed setup for your installation.
- Price Match Guarantee — beat any lower authorized dealer price by $50 on orders over $2,000.
- Free nationwide shipping. 30-day return period. Call or text (765) 508-4352, Mon–Fri 9 AM–5 PM EST.
Evolution Aqua Nexus EAZY 220 (NEXEAZ220): 4,800-gallon koi pond filter — stainless steel EAZY vessel with 18L K1 Micro static bed (mechanical) + outer moving bed with 50L K+ Media supplied/150L max (biological). Max flow 2,640 GPH. 49.6"×43.7"×33.5". 4" EazyConnectors inlet/outlet. Auto-Ready fitted. 2-year warranty. Air pump required — not included. Solid level base 1.2m×1.0m minimum required (warranty condition). White body — Titanium version available as NEXEAZ220TI.
Need an air pump, auto-cleaning system, UV clarifier, or the EAZY 320 for a larger pond? Call or text (765) 508-4352 — Monday through Friday, 9 AM to 5 PM EST.
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