---
product_id: 259450776
title: "Oase BioCompact 25, Aquarium Filter for Aquariums Up To 25 L | External Aquarium Filter for Freshwater and Marine Aquariums Up To 25 L With Adjustable Water Flow Up To 240 l/h"
brand: "oase"
price: "€ 47.33"
currency: EUR
in_stock: true
reviews_count: 13
category: "Oase"
url: https://www.desertcart.hr/products/259450776-oase-biocompact-25-aquarium-filter-for-aquariums-up-to-25
store_origin: HR
region: Croatia
---

# Ultra-quiet operation Energy-saving pump Adjustable flow up to 240 l/h Oase BioCompact 25, Aquarium Filter for Aquariums Up To 25 L | External Aquarium Filter for Freshwater and Marine Aquariums Up To 25 L With Adjustable Water Flow Up To 240 l/h

**Brand:** oase
**Price:** € 47.33
**Availability:** ✅ In Stock

## Summary

> 🐠 Small Tank, Big Impact: Filter Smarter, Not Louder!

## Quick Answers

- **What is this?** Oase BioCompact 25, Aquarium Filter for Aquariums Up To 25 L | External Aquarium Filter for Freshwater and Marine Aquariums Up To 25 L With Adjustable Water Flow Up To 240 l/h by oase
- **How much does it cost?** € 47.33 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/259450776-oase-biocompact-25-aquarium-filter-for-aquariums-up-to-25)

## Best For

- oase enthusiasts

## Why This Product

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

## Key Features

- • **Compact Powerhouse:** Maximize filtration in minimal space with a large filter surface.
- • **Flexible Installation:** Mount horizontally or vertically—ideal for aquariums and paludariums alike.
- • **Tailored Flow Control:** Customize water flow from 120 to 240 l/h for perfect aquatic harmony.
- • **Complete Eco-Friendly Set:** Includes activated carbon and sponge for crystal-clear water, all while saving energy.
- • **Whisper-Quiet Performance:** Keep your space serene with near-silent filtration technology.

## Overview

The Oase BioCompact 25 is a compact external aquarium filter designed for tanks up to 25 liters. Featuring an adjustable water flow rate up to 240 liters per hour, it offers efficient filtration through a large filter surface combined with activated carbon and sponge media. Its ultra-quiet, energy-saving pump ensures optimal water quality without disturbing your environment. Flexible installation options and a complete filtration set make it perfect for both freshwater and marine small-scale aquariums.

## Description

From the manufacturer The internal filter filters water in small aquariums with a volume of 25 or 50 litres. This is taken care of by the large filter surface and the fine activated carbon sponge. The water flow rate is 120–240 l/h and can be adjusted with the water diffuser. The filter operates very quietly and saves energy. It can be installed standing up or lying down. The internal filter is sold as a complete set with a 1.5 m long power cable.

Review: Great compact low flow quiet filter - I wanted a low flow filter for my fish tank which is a cubic 30x30x30 (cm). With this filter you can adjust the flow which is perfect for small fish and ideal for my betta fish. You can direct the flow in different directions with the added attachment and the filtration has been perfect for my tank, keeps it nice and clean in between water changes and when re-arranging my live plants. This filter is also very quiet which is perfect as the tank is situated in a bedroom. I would be careful when the handling of the filter, but it’s fine for me i just delicately wash the parts. Overall, impressed with this little filter.
Review: Excellent little filter that deserves more reviews - This is a great little filter for a small tank. I have them working in my small 25L tanks. Decent flow and uptake considering how small they are. They first appear small, cheap, and a bit crappy, but give them a chance. The sponges and granules both come out in little cartridges - like a mini Fluval. These filters are very good for their size and price. I've had one going for about 6 months now. Very reliable little things. The only downside is getting the suction cups on it - but maybe that's just a technique I haven't got!

## Features

- FLEXIBLE: Can also be installed horizontally and is therefore also suitable for use in paludariums
- EFFICIENT: Large filter surface in the smallest space for optimal water filtration
- OPTIMAL FILTRATION: The chamber for filter media can be filled separately. Includes: Filter sponge and activated carbon (only for BioCompact 50)
- EASY TO ADJUST: The water flow rate can be individually regulated at the outlet
- ECONOMICAL COMPLETE SET: Extremely quiet and energy-saving pumpOptimum filtration: The fine active carbon sponge provides effective water filtration

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07H6TSJJ4 |
| Best Sellers Rank | 37,542 in Pet Supplies ( See Top 100 in Pet Supplies ) 177 in Aquarium Filters |
| Brand | Oase |
| Colour | Black |
| Country of Origin | USA |
| Customer Reviews | 3.8 out of 5 stars 94 Reviews |
| Flow Rate | 240 Litres Per Hour |
| Global Trade Identification Number | 00706759551410 |
| Included Components | Filter |
| Item Dimensions L x W x H | 5.1L x 5.1W x 5.1H centimetres |
| Item Type Name | Aquarium, Filter |
| Item Weight | 0.22 Kilograms |
| Manufacturer | OASE GmbH |
| Manufacturer Warranty Description | 3 year manufacturer. |
| Material | Activated Carbon |
| Model Number | 55141 |
| Part Number | 55141 |
| Power source | Corded Electric |
| Product Style | Classic |
| Product dimensions | 5.1L x 5.1W x 5.1H centimetres |
| Smart Home Compatibility | Not Smart Home Compatible |
| Style | Classic |
| UPC | 706759551410 |
| Unit Count | 1 count |
| Usage | Indoor |

## Product Details

- **Brand:** Oase
- **Capacity:** 25 litres
- **Included components:** Filter
- **Installation type:** Freestanding
- **Item weight:** 0.22 Kilograms
- **Material:** Activated Carbon
- **Power source:** Corded Electric
- **Product dimensions:** 5.1L x 5.1W x 5.1H centimetres
- **Purification method:** Activated Carbon
- **Special feature:** Activated Carbon Filter

## Images

![Oase BioCompact 25, Aquarium Filter for Aquariums Up To 25 L | External Aquarium Filter for Freshwater and Marine Aquariums Up To 25 L With Adjustable Water Flow Up To 240 l/h - Image 1](https://m.media-amazon.com/images/I/51HcLG8wqqL.jpg)
![Oase BioCompact 25, Aquarium Filter for Aquariums Up To 25 L | External Aquarium Filter for Freshwater and Marine Aquariums Up To 25 L With Adjustable Water Flow Up To 240 l/h - Image 2](https://m.media-amazon.com/images/I/71rvhR8dslL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great compact low flow quiet filter
*by E***A on 19 February 2025*

I wanted a low flow filter for my fish tank which is a cubic 30x30x30 (cm). With this filter you can adjust the flow which is perfect for small fish and ideal for my betta fish. You can direct the flow in different directions with the added attachment and the filtration has been perfect for my tank, keeps it nice and clean in between water changes and when re-arranging my live plants. This filter is also very quiet which is perfect as the tank is situated in a bedroom. I would be careful when the handling of the filter, but it’s fine for me i just delicately wash the parts. Overall, impressed with this little filter.

### ⭐⭐⭐⭐⭐ Excellent little filter that deserves more reviews
*by A***D on 3 November 2019*

This is a great little filter for a small tank. I have them working in my small 25L tanks. Decent flow and uptake considering how small they are. They first appear small, cheap, and a bit crappy, but give them a chance. The sponges and granules both come out in little cartridges - like a mini Fluval. These filters are very good for their size and price. I've had one going for about 6 months now. Very reliable little things. The only downside is getting the suction cups on it - but maybe that's just a technique I haven't got!

### ⭐⭐⭐ Small
*by I***R on 28 January 2026*

Sponge filter so small needs cleaning every couple of days but it's compact will do the job but I'm looking to change it soon

## Frequently Bought Together

- OASE Indoor Aquatics Biocompact 25,Black
- Fluval 12694 Plant and Shrimp Stratum for Freshwater Fish Tanks, 8.8 lbs. – Aquarium Substrate for Strong Plant Growth, Supports Neutral to Slightly Acidic pH
- API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, White, Single, Multi-colored

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-07-13*