---
product_id: 16796285
title: "Undergravel Filteration Bottom Circular Bar 45.3\x 9.6 Under Gravel Filter Tube Aquarium"
brand: "corisrx"
price: "HK$663"
currency: HKD
in_stock: true
reviews_count: 8
url: https://www.desertcart.hk/products/16796285-undergravel-filteration-bottom-circular-bar-45-3-x-9-6
store_origin: HK
region: Hong Kong
---

# 55 Gallon Capacity 16.6cm Tube Length 16mm Pipe Diameter Undergravel Filteration Bottom Circular Bar 45.3\x 9.6 Under Gravel Filter Tube Aquarium

**Brand:** corisrx
**Price:** HK$663
**Availability:** ✅ In Stock

## Summary

> 🌊 Dive into Clarity with Every Bubble!

## Quick Answers

- **What is this?** Undergravel Filteration Bottom Circular Bar 45.3\x 9.6 Under Gravel Filter Tube Aquarium by corisrx
- **How much does it cost?** HK$663 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/16796285-undergravel-filteration-bottom-circular-bar-45-3-x-9-6)

## Best For

- corisrx enthusiasts

## Why This Product

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

## Key Features

- • **Robust Design:** Durable PVC tubes ensure longevity and reliability.
- • **Comprehensive Kit:** Includes 27 tubes and 7 L-shaped connectors for complete setup.
- • **Effortless Filtration:** Transform your aquarium into a crystal-clear oasis!
- • **Space-Saving Solution:** Maximize your aquarium's efficiency without compromising space.
- • **Versatile Connectivity:** Seamlessly connect with 16mm and 22mm pipes.

## Overview

The Undergravel Filtration Bottom Circular Bar is designed for aquariums up to 55 gallons, featuring a robust system of 27 tubes and 7 connectors, ensuring optimal water filtration and clarity. With a pipe diameter of 16mm and a total tube length of 16.6cm, this filtration system is both efficient and easy to install, making it a must-have for any aquarium enthusiast.

## Description

Undergravel Filteration Bottom Circular Bar 45.3\x 9.6 Under Gravel Filter Tube Aquarium

## Features

- connector 16mm
- Pipe diameter 22mm
- Circular bar tube is 16.6cm , Total 27 tubes
- PVC tube is 16.6cm , Total 3 tube
- Connector L Shape Joint , Total 7 pce

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Best Sellers Rank | #204,040 in Pet Supplies ( See Top 100 in Pet Supplies ) #3,348 in Aquarium Filter Accessories |
| Brand | CORISRX |
| Capacity | 55 Gallons |
| Customer Reviews | 3.8 out of 5 stars 153 Reviews |
| Item Weight | 0.63 Kilograms |
| Material | Polyvinyl Chloride (PVC) |
| Product Dimensions | 45.3"L x 9.65"W x 9.65"H |
| Shape | Round |

## Product Details

- **Brand:** CORISRX
- **Product Dimensions:** 45.3"L x 9.65"W x 9.65"H
- **Capacity:** 55 Gallons
- **Shape:** Round
- **Manufacturer:** UP AQUA

## Images

![Undergravel Filteration Bottom Circular Bar 45.3\x 9.6 Under Gravel Filter Tube Aquarium - Image 1](https://m.media-amazon.com/images/I/918giEX99+L.jpg)
![Undergravel Filteration Bottom Circular Bar 45.3\x 9.6 Under Gravel Filter Tube Aquarium - Image 2](https://m.media-amazon.com/images/I/51zU+qLHv6L.jpg)
![Undergravel Filteration Bottom Circular Bar 45.3\x 9.6 Under Gravel Filter Tube Aquarium - Image 3](https://m.media-amazon.com/images/I/81ZLPbtlqBL.jpg)
![Undergravel Filteration Bottom Circular Bar 45.3\x 9.6 Under Gravel Filter Tube Aquarium - Image 4](https://m.media-amazon.com/images/I/81B3C4TZqRL.jpg)
![Undergravel Filteration Bottom Circular Bar 45.3\x 9.6 Under Gravel Filter Tube Aquarium - Image 5](https://m.media-amazon.com/images/I/71kuHf4whHL.jpg)

## Questions & Answers

**Q: will this work with a 120 gallon tank or do we need to purchase 2 sets?**
A: yes I would order 2 sets for 120 gal   I have mine in a 60 gal and it was a perfect fit .. ( side note .. make sure any air stones are above the gravel .. my powerhead was sucking air through the tube until i moved it )

**Q: Will this work with course sand? Or will it fill with sand?**
A: Yes it should work , use an air pump do not use filter motor , you want the water to flow. A motor will  create pressure. If you’re concerned about sand filling the tube use a weed blocking fabric. Gardeners been using this fabric to block the sunlight out but water still goes through it

**Q: Will it work for a tank wifh no gravel?**
A: Not really... The gravel weighs it down and is PART of the filtration process... That'sa THE POINT of an under gravel filter

**Q: Can this be adapted/connected to a canister filter's intake?**
A: I have a gravel filtration system with an external canister and I literally never have to change my water on a 55 gallon. I add water as needed and clean the filter maybe once a month

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great well worth it if you ask me!
*by T***I on March 8, 2025*

The product works great! My pictures shows it fits great around a 1/2 CPVC (gray pipe not included). The filters tubes go under the gravel and optional under gravel filter, the rocks go on top to hide it all. A pond master model 3 pump pumps the water up to a filter not included of course. I only used two kits in my 180 gallon tank so it comes with a lot of parts so that's nice!

### ⭐⭐⭐⭐ Poor instructions, parts not compatible with filter
*by K***N on February 6, 2021*

I use a tetra whisper filter and this does not connect. I used heat via a lighter and electrical tape to jerry rig it and it works that way. There were no instructions so you have to figure it out which isn't too hard but definitely caused some initial confusion. Some of the pieces don't fit each other and had to be forced. I had to cut a few pieces to make them fit my filter as well. If you need pictures or measurements, I can post some if you contact me or use the "ask a question" function on this page(it usually send an email to everyone who has recently purchased it).Water seems to come out of the filter at a normal rate so it allows for decent movement. The tubes are somewhat larger so I needed a good 1-2 inches of gravel to fully cover it but petsmart sells the large bags for like $20-ish. I still HAVE to go through and vacuum my gravel out a couple of times a week as this sucks almost nothing up, not by its own fault, its just physics I assume. But don't expect this to help keep your gravel clean, there isn't enough suction. (I have a 40 gallon tank with a 40-50 gallon filter).

### ⭐ Missing a piece
*by L***T on January 15, 2025*

Trying to puzzle out instructions when I realized it was being complicated by a piece missing... all pieces were originally loose in the box, which is kind of questionable given the price. Still working out how to join everything together with non-existent instructions. Parts don't have threads, tolerance is a little iffy, wobbly when mostly assembled. Not sure how contacting customer service will be...Needed this to be up and running ASAP and this was what I was waiting on. So... guess I'll have to find an alternative

## Frequently Bought Together

- Undergravel Filteration Bottom Circular Bar 45.3\x 9.6 Under Gravel Filter Tube Aquarium
- Marineland Maxi-Jet 600, Multi-Use Water Pump And Power Head, Fully Convertible (ML90510), 160/750 GPH
- Penn-Plax Undergravel Aquarium Filter for 40-55 Gallon Tanks – Four 11.25” x 11.25” Plates – Under Gravel System for Clear, Clean Water – Safe for Freshwater and Saltwater Tanks (CFU55)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-02-19*