---
product_id: 71503769
title: "Reefer Filter Media Cup - 4\" Durable Aquarium Filter Sock Replacement - Easy Maintenance for Saltwater & Reef Tanks"
brand: "red sea"
price: "328 kr"
currency: DKK
in_stock: true
url: https://www.desertcart.dk/products/71503769-reefer-filter-media-cup-4-durable-aquarium-filter-sock-replacement
store_origin: DK
region: Denmark
---

# Universal Red Sea Reefer fit 1L media capacity Easy-clean design Reefer Filter Media Cup - 4" Durable Aquarium Filter Sock Replacement - Easy Maintenance for Saltwater & Reef Tanks

**Brand:** red sea
**Price:** 328 kr
**Availability:** ✅ In Stock

## Summary

> 🐠 Elevate your reef’s clarity with effortless filtration!

## Quick Answers

- **What is this?** Reefer Filter Media Cup - 4" Durable Aquarium Filter Sock Replacement - Easy Maintenance for Saltwater & Reef Tanks by red sea
- **How much does it cost?** 328 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/71503769-reefer-filter-media-cup-4-durable-aquarium-filter-sock-replacement)

## Best For

- red sea enthusiasts

## Why This Product

- Trusted red sea brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Optimized Capacity:** Holds up to 1 liter of filter media to maximize water clarity and tank health
- • **Durable & Reef-Ready:** Built tough for saltwater and reef tanks, ensuring long-lasting performance
- • **Seamless Integration:** Fits all Red Sea Reefer sump holders and compatible with REEFER and MAX systems
- • **Effortless Maintenance:** Drop-in design for quick media swaps and hassle-free cleaning
- • **Versatile Media Compatibility:** Supports filter pads, floss, biological media, carbon, and GFO for tailored filtration

## Overview

The Reefer Filter Media Cup is a durable 4-inch replacement filter sock designed for Red Sea Reefer and MAX aquarium systems. It holds up to 1 liter of various filter media, enabling customizable filtration for saltwater and reef tanks. Its drop-in design ensures easy maintenance and compatibility with all Red Sea Reefer sump holders.

## Description

Reefer Filter Media Cup - 4" Durable Aquarium Filter Sock Replacement - Easy Maintenance for Saltwater & Reef Tanks

## Features

- Red Sea Reefer Media Cups can be used in place of standard filter socks and be filled with a variety of filter materials.
- The design of the cup allows it to be dropped into the sock holder and can used with a wide variety of media, including: filter pads, filter floss, biological media, carbon, and GFO.
- Fits all Red Sea Reefer sump filter holders
- Easy to clean. Holds 1 liter of filter media.
- Compatible with REEFER and MAX systems

## Product Details

- **Brand:** Red Sea
- **Special Feature:** Reverse Osmosis
- **Product Dimensions:** 8"L x 4"W x 8"H
- **Material:** Plastic
- **Capacity:** 1 Liters
- **Included Components:** PHL306207
- **Package Information:** Bottle
- **Installation Type:** Countertop or Drop-in
- **Purification Method:** Activated Carbon, Reverse Osmosis
- **Model Name:** Red Sea 4 inch Filter Media Cup

## Images

![Reefer Filter Media Cup - 4" Durable Aquarium Filter Sock Replacement - Easy Maintenance for Saltwater & Reef Tanks - Image 1](https://m.media-amazon.com/images/I/51hq0ptUyAL.jpg)

## Questions & Answers

**Q: Does it fit the trigger sustem sumps filter sock holder?  The holes are oval**
A: I have a ruby 36 by trigger and the cups were a little loose. So my husband cut the rings off a couple of old filter socks and put the rings around the top of the filter cup and it fits nice and snug now.

**Q: And what is the best filter media to put inside?**
A: "Best" is 100% subjective based on the inhabitants of the tank and what you're doing. I use ChemiPure Elite or Blue (1 bag in as I've found two clogs it up).

**Q: can I put this in my sump w/filter floss inside ?**
A: Yes you can use filter floss

**Q: Will this replace 2.75 filter socks on waterbox aio???**
A: No - this is a 4" media cup designed to replace 4" filter socks. I have it on my 100.3 waterbox. I am not sure if RedSea makes a 2.75" media cup.

## Frequently Bought Together

- Red Sea Reefer Filter Media Cup
- Aquatic Experts Aquarium Filter Floss for Fish Tank Filters - FilterFirst Aquarium Filter Pad - Media Roll for Crystal Clear Water, 3/4" - 1" Thick (12 Inch Wide, 72 Inch Long)

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**Shop now:** [https://www.desertcart.dk/products/71503769-reefer-filter-media-cup-4-durable-aquarium-filter-sock-replacement](https://www.desertcart.dk/products/71503769-reefer-filter-media-cup-4-durable-aquarium-filter-sock-replacement)

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-04-23*