Modular expansion components: Allows users to add or replace individual modules for tailored filtration setups
Twist-lock compatibility: Ensures secure, tool-free installation within existing CaddyStack towers
Multiple mounting options: Supports both circle mount and square mount configurations for flexible system integration
Reef-safe PETG construction: Provides long-term durability and safety for saltwater environments
No raw metal or exposed magnets: Reduces risk of corrosion and chemical exposure for sensitive marine life
Summarized by Shop
CaddyStack™ – Modular Filter Tower Extensions & Spare Parts
These CaddyStack™ Modular Filter Tower Extensions are individual replacement and expansion components designed to work with the CaddyStack™ – Modular Filter Tower (Filter Sock Replacement Kit)
This product page is intended for reef keepers who already own a CaddyStack™ Starter
Compatible System Diameters
2, 2.75, 4, 4.7, 7 inches
Module Heights
Standardized across all sizes (e.g., 1 inch for short modules, 3 inches for tall modules)
Mount Types
Circle mount (used in most sump systems), Square mount (2.75 inch for flat edge or rear aio chambers)
Material
Reef-safe PETG plastic
Media Included
No
Power Source
Not specified
Summarized by Shop
5.0
4 ratings
5
4
3
2
1
Built with strong quality parts its perfect for stacking floss and other media easy to change floss daily as i needed beats the old sock method
Git up Charva
N
Nicola · August 12, 2026
Got this to cut out the center cage to ad to the other for a refugium basket in my hello reef