---
product_id: 27057727
title: "Black Holding Tank Cleaner"
brand: "walex"
price: "€ 25.32"
currency: EUR
in_stock: null
reviews_count: 13
category: "Walex"
url: https://www.desertcart.es/products/27057727-black-holding-tank-cleaner
store_origin: ES
region: Spain
---

# 12-24h waste breakdown Advanced enzyme formula Septic safe & eco-friendly Black Holding Tank Cleaner

**Brand:** walex
**Price:** € 25.32
**Availability:** ❌ Out of Stock

## Summary

> 🚐 Keep your RV running fresh & flawless—don’t get caught with a clogged tank!

## Quick Answers

- **What is this?** Black Holding Tank Cleaner by walex
- **How much does it cost?** € 25.32 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/27057727-black-holding-tank-cleaner)

## Best For

- walex enthusiasts

## Why This Product

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

## Key Features

- • **Swift Sensor Revival:** Restores RV black tank sensors for flawless readings every time.
- • **Powerful Enzyme Action:** Super-concentrated natural enzymes dissolve waste & paper buildup fast.
- • **Effortless, No-Mess Use:** Dissolvable packets make maintenance a breeze—just drop & go.
- • **Trusted American Quality:** Made in the USA since 1987, a leader in RV sanitation innovation.
- • **Valve & Seal Lubrication:** Keeps valves smooth and seals leak-free for worry-free travels.

## Overview

Walex Commando RV Black Holding Tank & Sensor Cleaner uses a powerful enzyme formula to eliminate waste and paper buildup within 12-24 hours, restoring sensor accuracy and lubricating valves and seals. Its dissolvable packets offer mess-free, septic-safe maintenance, ensuring your RV’s black tank operates smoothly and odor-free. Made in the USA by a trusted industry leader since 1987.

## Description

Bid farewell to the frustration of inaccurate sensor readings. Our RV holding tank cleaner swiftly restores sensor function, ensuring you always have an accurate view of your tank's status. The RV black water tank cleaner lubricates valves and seals, providing a layer of protection that ensures your RV's black tank functions seamlessly. No more worries about leaks or malfunctioning components. This powerful camper tank cleaner eliminates waste and paper buildup from your tank's walls, leaving them sparkling clean and removing odors in as little as 12 to 24 hours. Our super-concentrated enzyme trailer septic tank cleaner is scientifically developed to tackle the toughest waste and paper buildup. These natural enzymes penetrate waste caked to the tank walls and sensors, breaking down buildup and ensuring a thorough clean. Using Commando is a breeze, thanks to the easy-to-use dissolvable packets. No mess, no fuss—just drop it in and let the enzymes work their magic. Plus, it's septic system safe.

Review: Good product! - Worked as advertised on black water tank. Gauges started acting wonky, added product, drove to next campground, voila, gauges now working well!
Review: Wowzers! - So we bought a travel trailer third-hand. We believe the black water tank was emptied before it sat up for the past year, but not cleaned out in any way. So we've been having to force down waste for a couple weeks. I searched online for a solution because the regular black water tank treatments meant to dissolve current waste and toilet paper weren't helping at all. I used a method described by others online, putting hot water with dishwashing liquid into the tank. I even added baking soda for some softening and slip. That caused a rush of gunk to flow out and resulted in a really awful stench (I guess it got some of that old stuff moving!), but still stuff was clogging near the top. Maybe doing it again would have helped more, but I went ahead and bought this product after reading the good reviews. Well, we emptied the tank again (or so we thought) before replacing the toilet. After removing the old toilet, we realized the tank was clogged again and the waste was almost to the top. I opened a Commando packet and poured it right in. I cleaned up where the old toilet sat, my husband installed the new one, and I checked the sewage level with every flush expecting that at some point it would go down. About 6 hours later, I noted that the level had gone down some. It was still pretty high up, but that was progress, and I knew it would take longer. Well, I just checked again. It's been 20 hours since I poured the packet in and I was shocked to find that not only is the waste too far down for me to see it anymore, but I can see sunlight coming in through the tank walls. I don't see one bit of gunk stuck on it either and the stench is gone. My gosh, this stuff really works, and it only took one application. Keep in mind that we throw away most of the toilet paper (all from #1 but not #2), so it's not overburdened with toilet paper--at least not from us. Expecting more of an issue, I actually bought the bucket of 40 packets and I was expecting to use one a week. I'll see how it goes, but I may not actually need this many after all. I do not regret the purchase at all though.

## Features

- CLEANS RV HOLDING TANK AND SENSORS - The RV black tank and sensor cleaner helps restore sensor function and lubricates valves and seals, ensuring your RV's black tank functions smoothly.
- ELIMINATES WASTE BUILDUP - The RV tank cleaner eliminates waste and paper buildup from tank walls and sensors in 12 -24 hours. For stubborn issues, Commando can be safely used for a week or longer.
- ADVANCED ENZYME POWER - Our super-concentrated formula contains powerful natural enzymes, breaking down waste and paper ensuring a thorough cleanse for your RV black holding tank.
- EFFORTLESS MAINTENANCE - The RV holding tank cleaner is septic system safe. Continued use of Commando every 3 months will help keep your black tank and sensors in good working condition.
- MADE IN USA - Walex has been a global leader in developing and manufacturing premium odor control and sanitation products since 1987.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0177AJ64G |
| Best Sellers Rank | #6,862 in Automotive ( See Top 100 in Automotive ) #14 in RV Sewer Chemicals & Cleaners |
| Brand | Walex |
| Customer Reviews | 4.4 4.4 out of 5 stars (2,429) |
| Date First Available | January 25, 2016 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 2.39 ounces |
| Item model number | CMDOBG |
| Manufacturer | Walex Products Company, Inc |
| Manufacturer Part Number | CMDOBG |
| Model | CMDOBG |
| Product Dimensions | 8 x 5 x 2 inches |
| Special Features | Concentrated |

## Product Details

- **Brand:** Walex
- **Item Form:** Tablet
- **Material Feature:** Natural
- **Scent:** Ocean Mist
- **Specific Uses For Product:** Toilet, RV Black Holding Tank

## Images

![Black Holding Tank Cleaner - Image 1](https://m.media-amazon.com/images/I/81zggOELBeL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good product!
*by D***S on October 19, 2025*

Worked as advertised on black water tank. Gauges started acting wonky, added product, drove to next campground, voila, gauges now working well!

### ⭐⭐⭐⭐⭐ Wowzers!
*by L***O on May 6, 2020*

So we bought a travel trailer third-hand. We believe the black water tank was emptied before it sat up for the past year, but not cleaned out in any way. So we've been having to force down waste for a couple weeks. I searched online for a solution because the regular black water tank treatments meant to dissolve current waste and toilet paper weren't helping at all. I used a method described by others online, putting hot water with dishwashing liquid into the tank. I even added baking soda for some softening and slip. That caused a rush of gunk to flow out and resulted in a really awful stench (I guess it got some of that old stuff moving!), but still stuff was clogging near the top. Maybe doing it again would have helped more, but I went ahead and bought this product after reading the good reviews. Well, we emptied the tank again (or so we thought) before replacing the toilet. After removing the old toilet, we realized the tank was clogged again and the waste was almost to the top. I opened a Commando packet and poured it right in. I cleaned up where the old toilet sat, my husband installed the new one, and I checked the sewage level with every flush expecting that at some point it would go down. About 6 hours later, I noted that the level had gone down some. It was still pretty high up, but that was progress, and I knew it would take longer. Well, I just checked again. It's been 20 hours since I poured the packet in and I was shocked to find that not only is the waste too far down for me to see it anymore, but I can see sunlight coming in through the tank walls. I don't see one bit of gunk stuck on it either and the stench is gone. My gosh, this stuff really works, and it only took one application. Keep in mind that we throw away most of the toilet paper (all from #1 but not #2), so it's not overburdened with toilet paper--at least not from us. Expecting more of an issue, I actually bought the bucket of 40 packets and I was expecting to use one a week. I'll see how it goes, but I may not actually need this many after all. I do not regret the purchase at all though.

### ⭐⭐⭐⭐ Black Tank Bio Bomb
*by C***T on September 25, 2025*

Have used this product several times as directed and it seems to help clear the black tank, but not completely. It could be a bad or stuck sensor that will not clear.

## Frequently Bought Together

- Walex Commando RV Black Holding Tank & Sensor Cleaner - Eliminates Waste & Paper Buildup, Restores Sensor Function, Lubricates Valves & Seals, Advanced Enzyme Formula; Dissolvable Packets, 4 Count
- Walex Elemonate Grey Water Tank Deodorizer & Freshener - Freshens Sink & Drain Lines, Rapid Dissolving Drop-In Tablets, Ideal for RV's, Boats & Homes, Easy to Use - Fresh Lemon Scent, 5 Pack
- Camco TST MAX RV Toilet Treatment Drop-INs - Control Unwanted Odors & Break Down Waste and Tissue - Safe Septic Tank Treatment - Orange Scent, 30-Pack (41183)

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---

*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-03-19*