PRO-Line Aqua 4″ Aerated Bottom Drain (1″ Duct)
Professional Bottom Drain with Integrated Aeration for Koi & Large Pond Systems
 
The PRO-Line Aqua 4″ Aerated Bottom Drain is a core component in any serious koi or large pond build, designed to efficiently remove bottom waste while simultaneously oxygenating the pond through integrated aeration.
Supplied with a 1″ direct air feed connector, this unit provides a clean, reliable solution for combining waste removal and aeration in a single, purpose-built fitting.
 
Why an Aerated Bottom Drain Is Essential
Continuously removes sinking waste from the pond floor
Improves circulation patterns by drawing debris toward the drain
Integrated aeration dome lifts waste into suspension
Enhances oxygen levels for fish and beneficial bacteria
This is best practice for koi pond construction.
 
Integrated Aeration System
Built-in aeration dome mounted above the drain
Supplied with 1″ direct air feed connector
Designed for connection to an external air pump
Rising air column improves:
Bottom drain efficiency
Overall pond circulation
Oxygen distribution
The aeration dramatically increases the effectiveness of the 4″ drain line.
 
Heavy-Duty Construction
4″ bottom drain outlet – ideal for gravity-fed filtration
Smooth internal surfaces for efficient waste transport
Built for permanent installation in:
Concrete ponds
Liner ponds (with correct installation method)
Designed for long-term reliability in high-load systems.
 
Typical Applications
Koi ponds
Large garden ponds
High-stock systems
Gravity-fed filtration layouts
Professional and trade pond builds
Pairs perfectly with sieves, drum filters, and settlement chambers.
 
Key Features at a Glance
4″ gravity outlet
Integrated aerated dome
1″ air duct with direct air feed connector included
Improves waste removal and oxygenation
Professional-grade construction
 
Bottom Line
The PRO-Line Aqua 4″ Aerated Bottom Drain is a must-fit component for any serious pond build. By combining efficient bottom waste removal with powerful aeration, it improves water quality, filtration efficiency, and fish health—making it the correct foundation for a high-performance koi pond system.