Porta-Pak Express Holding Tank Deodorizer

The Convenient Economical Drop-In for Daily Service Routes

PORTA-PAK® EXPRESS is the smaller-dose drop-in holding tank deodorizer designed specifically for portable sanitation operators servicing units daily or operating in mild and cool climates. When full-strength treatments aren’t necessary, Express delivers dependable odor control in a lighter, more economical charge.

Powered by Walex WAVE2® odor control technology, PORTA-PAK® EXPRESS provides professional-grade odor prevention in a pre-measured, water-soluble packet. Just drop a single packet into the holding tank, add water, and place the unit into service—no measuring, no spills, no mess.

How to Use

Add one (1) PORTA-PAK® EXPRESS packet into the portable restroom holding tank by flushing or direct addition.
Add five (5) to eight (8) gallons of fresh water to the tank.
Allow the packet to dissolve completely before placing the unit into service.
One packet controls odor and treats wastewater per application.

Download Technical Data Sheet

What Is PORTA-PAK® EXPRESS Used For?

PORTA-PAK® EXPRESS is a commercial holding tank deodorizer used to control odors and treat waste in portable toilets and restroom trailers that are serviced daily or operating in mild or cooler weather conditions.

It is ideal for routes where frequent service intervals do not require maximum-strength chemistry but still demand reliable, professional odor control. As a portion-controlled blue deodorizer and holding tank treatment, PORTA-PAK® EXPRESS helps maintain clean, odor-free units while optimizing chemical usage.

How Does PORTA-PAK® EXPRESS Work?

PORTA-PAK® EXPRESS utilizes Walex’s proprietary WAVE2® odor control technology to deliver dependable odor prevention in portable restroom holding tanks. Once placed in the tank and combined with water, the water-soluble packet dissolves quickly and disperses evenly throughout the tank.

The formula contains active ingredients engineered to break down paper and waste while suppressing odor-causing bacteria. Its non-staining blue color enhances tank appearance without leaving residue, providing a clean, professional look from service to service.

Designed for daily service and moderate conditions, PORTA-PAK® EXPRESS delivers consistent performance without over-treating units.

Key Features & Benefits

Optimized Low-Dose Formula – Ideal for units serviced daily or operating in mild and cool climates.
Reliable Odor Control – Provides dependable deodorizing power between frequent service intervals.
Rapid Waste Breakdown – Helps break down paper and waste for efficient tank performance.
Non-Staining Blue Color – Professional appearance without staining tank components.
Commercial-Grade Performance – Engineered for portable toilet and restroom trailer applications.
Excellent for Mild & Cool Weather – Designed for climates where maximum-strength formulas aren’t required.
Formaldehyde-Free – Meets modern sanitation standards.
Biodegradable – Designed for responsible waste treatment.
Water-Soluble Portion Control – Convenient drop-in packet eliminates measuring and overpouring.

Ideal For

Portable restroom operators servicing units daily
High-turn construction sites
Short-duration events
Cool or mild climate routes
Restroom trailers with frequent pump-outs
Operators looking to optimize chemical usage per service cycle

Frequently Asked Questions

I added the right amount of deodorizer. Why does it smell bad?

The most common reason your deodorizer isn’t performing as well is inadequate water, which leads to mounding. We recommend adding 5-8 gallons of water to ensure all waste and paper falls below the water line. Water is the vehicle that delivers the deodorizer to the waste.

Why is it that deodorizer looks more green than blue by the end of the week?

Urine changes the pH of the contents of your holding tank, which causes the dye to fade from dark blue to green. Heavy usage and hot weather makes this problem worse. When your customers see the green color, they believe the deodorizer has worn off, even though that’s not necessarily true. Walex recently created a new dye called DuraBlue, which better withstands these shifts in pH. DuraBlue retains its deep blue color through day seven. Like other Walex dye, it won’t stain or cause problems at waste treatment plants. Durablue is available in all Walex packets and liquids.

What’s better, liquid or packets?

It’s a matter of personal preference because there are pros and cons to each. Packets are easy to use because they’re mess-free and pre-portioned. Walex liquids are versatile because they’re available in more strengths and fragrances. Which product is more cost-effective also depends on usage. To learn more about which deodorizer best fits your needs, read our article about selecting a deodorizer.

My units have a bad odor even when they’re empty. How do I get rid of that?

Every time you empty the unit, a little bit of residual waste can remain on the tank walls. If you don’t scrub off this “sludge line,” over time, the waste will become caked to the tank walls and be very hard to remove. Walex makes a product called Commando that deep cleans these troublesome units. To use Commando, drop one packet in per 100 gallons of tank capacity and add enough water to fill the tank completely. The enzymes target and liquefy any solids so when you empty the tank 12 to 24 hours later, it’s good as new.

What fragrance should I get?

Walex offers a wide variety of fragrances, so it’s a matter of personal preference. We do recommend switching fragrances every few months because your brain can acclimate to smells. If you’re interested in trying different fragrances, call your account manager and ask for samples.

Do I need to mix the water and deodorizer in a bucket before emptying it into the tank?

No, you can add the packet or liquid directly into the holding tank. We recommend adding deodorizer before water so everything is better mixed together.

I use packs. Can I add two if I need extra odor control?

Many drivers who use regular Porta-Pak add two packs if extra odor control is needed. However, we recommend switching to Porta-Pak MAX, which is a more powerful packet designed for extreme conditions. Porta-Pak MAX is a super-concentrated formula with 50% more color, 50% more odor control, and double the fragrance of original Porta-Pak.

Is waste treated with Walex products accepted at all waste treatment plants?

Yes. Standards for accepted waste at treatment plants vary across the country, but we are not aware of any waste treatment plant that does not accept waste treated by Walex products. If you encounter any issues from waste treatment plants, please contact us.

I’m thinking about adding restroom trailers to my portable restroom business. Are there any extra cleaning or deodorizing products I should invest in?

Yes. To offer a premium restroom trailer rental, we recommend ingesting in P-Trapper Waterless Urinal Odor Control, Commando Holding Tank Cleaner, and Ovation Air Freshener, if you don’t already have these products. For a full list of products to keep your restroom trailer fresh and clean, read our blog.

Products Trusted by Industry Leaders

“From the very beginning, Walex has played a key role in helping us deliver on our mission to provide clean, dependable, and high-quality sanitation services across Southern California. Their innovative products and reliability have supported our teams in the field, allowing us to meet the high standards of service our customers count on. Whether it’s the consistency and effectiveness of their deodorizing products or their dependable staff, Walex has helped us do our job better—day in and day out.”

— Rudy Lopez, Chief Executive Officer, Southern California Industries

“Walex’s customer service is next level. Their products are always shipped in a timely manner, same day if not the next, and are on time. The staff has always made us feel we are family to them. Can’t say enough good things about Walex as a company!”

— Hunter Schenk, Tuff Jon

“The experience I’ve had as it relates to Walex has been nothing less than amazing. I am truly appreciative of everything you all do to ensure ROS stays ahead of the curve on providing top tier service.”

— Anthony Sims, United Rentals

“Walex is a very special company with an owner and team members who strive for the best products and services, showing they care, have integrity, and want to help raise the bar in our industry and help their customers. We feel like family.”

— Andy Gump Family & Team

“Working with Walex has been a real win for our business. They’re quick to respond to orders, always deliver on time, and help us keep things running smoothly—especially during our busiest seasons. Their communication is clear and consistent, so we’re never left guessing about where things stand. It’s great to have a supplier that understands the pace and demands of the porta john business. Walex has become a trusted partner.”

— Kellie Sicilian, Procurement Specialist, MPW Services

“We’ve used Walex for more than a decade and find it to be the most consistent and reliable vendor we’ve had. When you order from the outstanding sales group you know you’re getting industry best performance. Walex has been a true value to our business and customers.”

— Brian Knoper, Owner, Kerkstra Portable Restrooms