Klir Di-4 V2 Automatic Drop-In Fleece Filter, 4in

Klir Di-4 V2 Automatic Drop-In Sump Fleece Filter for Sumps

The Klir Di-4 V2 Automatic Drop-In Sump Fleece Filter (SKU: CV-KLIR-DI4V2) is an authentic high-efficiency mechanical filtration system distributed by CoralVue to streamline aquarium maintenance and maintain pristine water clarity in marine reef aquariums and freshwater ecosystems. Traditional mechanical filtration relies heavily on cloth filter socks that require messy manual pulling, bleaching, and swapping every few days. If left uncleaned, trapped fish waste, uneaten food flakes, and detritus remain submersed in the active flow path where they rapidly decay—spiking internal nitrate and phosphate levels. The Klir Di-4 V2 completely breaks this nutrient cycle by automatically rolling dirty material completely out of the water column and replacing it with a fresh, clean section of 50-micron non-woven fleece, stabilizing your water parameters for months at a time.

This upgraded Version 2 system features an overhauled electronic smart board and a magnetic-mount optical water sensor that completely eliminates the mechanical micro-switch stickiness common in older rollers. As water flows from your display tank's drain line into the core of the Klir, the dense fleece captures suspended particulate matter. As the fabric becomes saturated with waste, water flow slows down, causing the level inside your sump's sock tray compartment to rise. The moment the water touches the triple-redundant optical eyes, the heavy-duty 12V DC geared motor activates, pulling the spent fleece onto the dirty collection spool. Once clean, porous fleece is exposed, the water level instantly recedes, deactivating the motor loop. This continuous, self-monitoring system provides clear, particle-free water while drastically reducing your physical maintenance footprint.

Key Features:

• Locks Away Dissolved Organics Safely: Exports debris out of the active water volume before it breaks down, directly preventing aggressive hair algae and cyanobacteria outbreaks.

• V2 Anti-Slack Tension Ring System: Incorporates upgraded internal structural friction rings that prevent the fleece roll from unspooling loosely or causing bypass water gaps.

• Ready for Advanced Smart Controllers: Natively compatible with the CoralVue HYDROS ecosystem via dedicated adapter cable kits for integrated smart home status tracking.

Note: This complete retail system contains (1) Klir Di-4 V2 unit, 3.9" & 4.25" swappable collars, a V2 smart controller, a magnetic optical sensor, (1) starter 25-yard 50-micron fleece roll, and a 12V power supply. Standalone replacement fleece rolls and custom open-sump mounting brackets are sold under separate product categories.

Technical Sump Clearance Requirements:

To ensure a successful drop-in installation without modification, your aquarium sump must meet the following structural tolerances:

• Sock Tray Base Support: Sump must have a dedicated sock tray panel (or utilize the standalone Klir Di-4 Filter Bracket).

• Upper Operating Clearance: Must be capable of holding at least 1.5 inches of standing water directly above the sock tray line to allow for proper sensor triggering.

• Lower Vertical Clearance: Requires at least 8.125 inches of clear, unobstructed open space underneath the filter sock tray to house the fleece cylinder body.

• Overhead Access Space: Demands a minimum of 7.125 inches of open sump lid clearance directly above the sock tray to allow for easy roll swaps.

Online exclusive: this item is ordered in for you and is usually ready within a few business days. Choose in-store pickup, local delivery or shipping at checkout.