Aqua Ultraviolet – Ultima II 4,000 Filter with 1.5" Multi-Port Valve

Overview

Dependable, pressurized bead/bio filter for ponds and water features up to 4,000 gallons. The Ultima II 4,000 uses non-clogging media and a powerful cyclonic backwash to keep water clear with minimal routine maintenance—great for koi ponds and heavily stocked water gardens.

Key Features

• Bead + biological filtration with high–surface area Bio-Tubes

• Cyclonic backwash lifts and purges debris fast—no messy media handling

• 1.5" multi-port valve with simple positions (Filter, Backwash, Rinse, Waste, Recirculate, Closed)

• Low head-loss design for efficient pump pairing and long plumbing runs

• UV- and weather-resistant vessel for outdoor equipment pads (non-submersible)

Sizing & Flow Guidance

• Pond capacity: up to 4,000 gal (heavier stocking/full sun may require upsizing)

• Target pump flow: ~3,000–4,500 GPH through the 1.5" valve

• Backwash when pressure rises ~5–8 psi above clean baseline

Specifications

• Model: Ultima II 4,000

• Valve: 1.5" side-mount multi-port

• Ports: 1.5" slip at valve (adapt as needed)

• Operation: Pressurized, backwashable bead/bio-media system

• Install: Level, well-supported base; outdoor-ready housing

• Warranty: Manufacturer limited warranty on tank/valve (see terms)

What’s Included

• Ultima II 4,000 filter vessel pre-loaded with media

• 1.5" multi-port valve (handle & sight glass)

• Union/tailpiece set (model dependent)

• Quick start/installation guide

Installation Notes

1. Set on a level, load-bearing pad near the pump and returns.

2. Plumb pump to valve IN, valve OUT to pond/returns; add a WASTE line for backwash.

3. Use unions and 1.5" PVC to minimize head loss; keep runs smooth/short.

4. On startup, run Rinse briefly, then switch to Filter.

5. Backwash at +5–8 psi over clean baseline or on a regular schedule in high-load systems.