---
product_id: 325499712
title: "Whisper In-Tank Filter 40i with BioScrubber - 20-40 gallon (25818), Black"
brand: "tetra"
price: "R1621"
currency: ZAR
in_stock: true
category: "Tetra"
url: https://www.desertcart.co.za/products/325499712-whisper-in-tank-filter-40i-with-bioscrubber-20-40-gallon
store_origin: ZA
region: South Africa
---

# 170 GPH air-driven flow Ultra-quiet in-tank motor Dual-sided dense mesh filter Whisper In-Tank Filter 40i with BioScrubber - 20-40 gallon (25818), Black

**Brand:** tetra
**Price:** R1621
**Availability:** ✅ In Stock

## Summary

> 💧 Whisper-quiet power that keeps your aquarium pristine and your space stylish.

## Quick Answers

- **What is this?** Whisper In-Tank Filter 40i with BioScrubber - 20-40 gallon (25818), Black by tetra
- **How much does it cost?** R1621 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/325499712-whisper-in-tank-filter-40i-with-bioscrubber-20-40-gallon)

## Best For

- tetra enthusiasts

## Why This Product

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

## Key Features

- • **Powerful Oxygenation:** Air-driven design pumps up to 170 gallons per hour, keeping aquatic life vibrant and thriving.
- • **Dual-Action Filtration:** Dense, dual-sided mesh traps debris and fish waste efficiently for crystal-clear water.
- • **Effortless Maintenance:** Large Bio-Bag cartridges snap in and out easily, minimizing downtime and mess.
- • **Seamless Wall Placement:** Mounts inside tank for flush-to-wall setups, perfect for sleek modern spaces.
- • **Whisper-Quiet Operation:** Submerged motor drastically reduces noise, creating a peaceful aquatic environment.

## Overview

The Tetra Whisper In-Tank Filter 40i is a compact, all-in-one internal filtration system designed for 20-40 gallon aquariums. Featuring an air-driven motor that filters up to 170 GPH while oxygenating water, it mounts inside the tank to allow flush placement against walls. Its dual-sided dense mesh efficiently traps debris and fish waste, and large Bio-Bag cartridges make maintenance quick and clean. Known for ultra-quiet operation, this filter is ideal for creating a serene aquatic environment without sacrificing performance.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002DHYH2 |
| Best Sellers Rank | #23,286 in Pet Supplies ( See Top 100 in Pet Supplies ) #1,344 in Aquarium Accessories |
| Brand | Tetra |
| Brand Name | Tetra |
| Color | black |
| Colour | black |
| Customer Reviews | 4.2 out of 5 stars 21,476 Reviews |
| EU Spare Part Availability Duration | 1 Years |
| Global Trade Identification Number | 00046798258186 |
| Included Components | Whisper In-Tank Filter 40i (upto 40 Gal) |
| Item Type Name | Tetra Whisper Internal Filter 20 To 40 Gallons, For aquariums, In-Tank Filtration With Air Pump |
| Item Weight | 1.5 Pounds |
| Item weight | 1.5 Pounds |
| Manufacturer | Tetra |
| Manufacturer Part Number | AQ-65818 |
| Material | 100% Polyester |
| Material Type | 100% Polyester |
| Model Number | AQ-65818 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Product Style | In-Tank |
| Specific Uses For Product | Active |
| Style | In-Tank |
| UPC | 046798258186 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Tetra
- **Color:** Black
- **EU Spare Part Availability Duration:** 1 years
- **Global Trade Identification Number:** 00046798258186
- **Item Weight:** 1.5 pounds
- **Manufacturer:** Tetra
- **Material:** Polypropylene
- **Number of Items:** 1
- **Style:** CN

## Images

![Whisper In-Tank Filter 40i with BioScrubber - 20-40 gallon (25818), Black - Image 1](https://m.media-amazon.com/images/I/81f9MQBJUkL.jpg)

## Available Options

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

## Frequently Bought Together

- Tetra Whisper Internal Filter 20 To 40 Gallons, For Aquariums, In-Tank Filtration With Air Pump
- Tetra Whisper Bio-Bag Filter Cartridges For Aquariums - Ready To Use BLUE, Large, 3 Count (Pack of 1)
- TetraFauna AquaSafe for Reptiles and Amphibians 3.38 Ounces, Aqua-Terrarium Water Conditioner, Makes Tap Water Safe

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**Shop now:** [https://www.desertcart.co.za/products/325499712-whisper-in-tank-filter-40i-with-bioscrubber-20-40-gallon](https://www.desertcart.co.za/products/325499712-whisper-in-tank-filter-40i-with-bioscrubber-20-40-gallon)

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-08-30*