deodorizer
Why Does My Black Tank Smell So Bad During the Summer?
Understanding and Preventing RV Black Tank Odor Issues in Hot Weather
If you’ve spent any time RVing in hot weather, you may have encountered a strong and persistent smell coming from your black tank. You're not alone. Summer RV odor issues are incredibly common due to the heat’s impact on waste breakdown and bacterial growth in RV holding tanks. As RV tank temperatures rise, so does the intensity of the odors. The confined space inside an RV only makes it more noticeable. Whether you're camping in the desert or parked at a sunny campsite, understanding the heat effects on RV tanks is essential for a more pleasant experience.
What Causes Black Tank Smells When It's Hot?
Black tank smells during summer are often due to the accelerated decomposition of waste at high temperatures. When heat builds up inside your RV’s waste system, it intensifies odor production and exacerbates RV waste system challenges. Odors are caused by anaerobic bacteria, which thrive in high temperatures. The warm environment acts like an incubator, speeding up bacterial activity and producing noxious gases like ammonia and hydrogen sulfide.
Managing RV Tank Smells: Products and Practices
The best strategy for managing RV tank smells in the heat involves regular maintenance and the right sanitation products. Porta-Pak is the industry's gold standard for combatting summer odors. Walex's team of R&D scientists originally created the Porta-Pak formula to control odors inside portable restrooms and later adapted it for the less-demanding RV environment. Still, it remains in a class of its own when it comes to odor control, with the ability to provide immediate and long-lasting freshness.
Water: A Key Ingredient in Preventing Black Tank Odors in Hot Weather
Preventing black tank odors begins with routine RV holding tank care. Always start with a clean tank—after dumping, add 1.25 gallons of water for every 10 gallons of tank capacity before dropping in a deodorizer. This helps submerge waste and prevent the “poo pyramid” from forming above the waterline. Adding inadequate water is one of the most common causes of black tank odors.
Hot Weather RV Maintenance Tips
In addition to using the best RV black tank treatments and adequate water, hot weather RV maintenance also includes keeping your RV cool and shaded when possible. Store your RV with windows cracked open for ventilation and park with your black tank side away from direct sun exposure. Use vent fans or an odor-neutralizing product inside the RV, like Walex’s Assure, to control smells at their source. Clean your tank regularly with Commando, an enzyme-based black tank cleaner that eliminates lingering odors and restores malfunctioning sensors. These are all essential summer RV sanitation tips to enhance your overall experience.
Stay Ahead of Summer RV Plumbing Problems
With proper knowledge and the right tools, preventing RV tank issues in the summer becomes manageable. From using black tank treatments that excel at odor control to understanding RV holding tank cleaning routines, these odor control in hot climates tips can save your trip. Always travel with proven solutions and make odor control in RVs part of your regular summer RV care checklist. Don’t let black tank smells ruin your adventure—equip yourself with effective, trusted products and enjoy the open road without the stink.
Walex RV Liquid Essentials for Summer
Walex helps get your customers ready for the road this Summer with their all-new liquid essentials for black and grey tank treatment, as well as a premium washing & waxing mixture that both cleans and protects. Designed to meet the diverse needs of RV consumers, these new products bring superior performance, refreshing fragrances, and versatile options to the market. Most of the new additions introduce liquid versions of Walex’s best-selling holding tank treatments that have previously been available only in a drop-in form. The liquid versions offer a new solution to satisfy the needs of every Walex customer.
Check out our entire line of RV holding tank treatments, deodorizers, and cleaners for 2025.
Bio-Fresh Liquid Enzyme-Based Holding Tank Treatment
The perfect companion for RV holding tanks. Designed with a next-generation enzyme formula, it eradicates odors naturally while breaking down waste and all types of toilet paper. Biocide-free so it’s safe for septic systems and environmentally sensitive areas. Available in 32oz, 64oz, and 1-Gallon.
BIO-FRESH - Ocean Mist Scent
BIOFROM32 Bio-Fresh 32 oz Ocean Mist, Case (8/cs)
BIOFROM64 Bio-Fresh 64 oz Ocean Mist Case (8/cs)
BIOFROM1G Bio-Fresh 1-Gallon Ocean Mist, Case (4/cs)
BIOFROM32CA Bio-Fresh 32 oz Ocean Mist, Dual Language, Case (8/cs)
BIO-FRESH - Alpine Fresh Scent
BIOFRAF32 Bio-Fresh 32 oz Alpine Fresh, Case (8/cs)
BIOFRAF64 Bio-Fresh 64 oz Alpine Fresh, Case (8/cs)
BIOFRAF1G Bio-Fresh 1-GallonAlpine Fresh, Case (4/cs)
BIOFRAF32CA Bio-Fresh 32 oz Alpine Fresh, Dual Language, Case (8/cs)
Citra-Fresh Liquid Holding Tank Deodorizer
Robust odor control with natural citrus fragrance for a refreshing travel experience. Citra-Fresh stimulates the growth of good bacteria in your holding tank, which prevents bad bacteria from causing foul odors, resulting in up to 7 days of maximum odor control. Available in 32oz, 64oz, and 1-Gallon sizes.
CITRAFR32 Citra-Fresh 32 oz Citrus, Case (8/cs)
CITRAFR64 Citra-Fresh 64 oz Citrus, Case (8/cs)
CITRAFR1G Citra-Fresh 1-Gallon Citrus, Case (4/cs)
CITRAFR32CA Citra-Fresh 32 oz Citrus, Dual Language, Case (8/cs)
Commando Liquid Black Holding Tank and Sensor Cleaner
This super-charged enzyme formula liquefies waste, toilet paper and gunk built up on your black tank walls & sensors in as little as 12 hours. The go-to product for RV Techs when troubleshooting sensor issues during service. Now available in a user-friendly 32oz liquid formula.
CMDOLQ32 Commando 32 oz Liquid, Case (8/cs)
Elemonate Liquid Grey Water Deodorizer
Unmatched triple-action formula cleans, deodorizes and freshens RV grey tanks. Walex scientists perfected this blend of digestive enzymes that eliminate odors at the source, dissolving grease, food particles and organic sludge to keep grey tanks and drain lines clean.
ELEMLQ32 Elemonate 32 oz Liquid, Case (8/cs)
RV/Marine Wash & Wax
High-foam, deep-cleaning formula eliminates dirt, grime and tough residues, leaving surfaces spotless. Advanced polymer technology delivers exceptional sheeting and beading action while providing a brilliant, long-lasting high-shine finish. Available in 32oz, 64oz, 1-Gallon, and 5-Gallon sizes.
WALWW32 RV/Marine Wash & Wax, 32 oz, Case (8/cs)
WALWW64 RV/Marine Wash & Wax, 64 oz, Case (8/cs)
WALWW1G RV/Marine Wash & Wax, 1-Gallon, Case (4/cs)
WALWW5G RV/Marine Wash & Wax, 5-Gallon, Single (1)
Walex is committed to delivering premium, versatile products that align with your unique preferences and needs. Our expansion reflects our dedication to innovation and our mission to offer comprehensive solutions for every holding tank and cleaning challenge.
You're Going to Love Walex RV's New Premium Products for 2025!
Walex is excited to announce our new products for 2025 that include the latest premium liquid holding tank treatments and cleaning solutions. Designed to meet the diverse needs of RV and Marine consumers, these new products bring superior performance, refreshing fragrances, and versatile options to the market. Many of the new additions introduce liquid versions of Walex’s best-selling holding tank treatments that have previously been available only in a sachet, drop-in form. The liquid versions offer a new solution to satisfy the needs of every Walex customer.
Check out the list below of all our new RV/Marine products for 2025 and be sure to contact your authorized retailer or distributor for information on how to purchase yours.
Bio-Fresh Liquid Enzyme-Based Holding Tank Treatment
A liquid adaptation of our industry-leading Bio-Pak formula that combines advanced enzyme technology for exceptional deodorization and efficient waste and paper digestion. It is available in two refreshing fragrances, Ocean Mist and Alpine Fresh, and comes in three convenient sizes: 32oz, 64oz, and 1-Gallon.
BIO-FRESH - Ocean Mist Scent
BIOFROM32 Bio-Fresh 32 oz Ocean Mist, Case (8/cs)
BIOFROM64 Bio-Fresh 64 oz Ocean Mist Case (8/cs)
BIOFROM1G Bio-Fresh 1-Gallon Ocean Mist, Case (4/cs)
BIOFROM32CA Bio-Fresh 32 oz Ocean Mist, Dual Language, Case (8/cs)
BIOFROM64CA Bio-Fresh 64 oz Ocean Mist, Dual Language, Case (8/cs)
BIOFROM1GCA Bio-Fresh 1-Gallon Ocean Mist, Dual Language, Case (4/cs)
BIO-FRESH - Alpine Fresh Scent
BIOFRAF32 Bio-Fresh 32 oz Alpine Fresh, Case (8/cs)
BIOFRAF64 Bio-Fresh 64 oz Alpine Fresh, Case (8/cs)
BIOFRAF1G Bio-Fresh 1-GallonAlpine Fresh, Case (4/cs)
BIOFRAF32CA Bio-Fresh 32 oz Alpine Fresh, Dual Language, Case (8/cs)
BIOFRAF64CA Bio-Fresh 64 oz Alpine Fresh, Dual Language, Case (8/cs)
BIOFRAF1GCA Bio-Fresh 1-Gallon Alpine Fresh, Dual Language, Case (4/cs)
Citra-Fresh Liquid Holding Tank Deodorizer
This premium liquid product offers a powerful deodorizing solution featuring an invigorating Citrus fragrance. It delivers robust odor control technology and is available in 32oz, 64oz, and 1-Gallon sizes.
CITRAFR32 Citra-Fresh 32 oz Citrus, Case (8/cs)
CITRAFR64 Citra-Fresh 64 oz Citrus, Case (8/cs)
CITRAFR1G Citra-Fresh 1-Gallon Citrus, Case (4/cs)
CITRAFR32CA Citra-Fresh 32 oz Citrus, Dual Language, Case (8/cs)
CITRAFR64CA Citra-Fresh 64 oz Citrus, Dual Language, Case (8/cs)
CITRAFR1GCA Citra-Fresh 1-Gallon Citrus, Dual Language, Case (4/cs)
Commando Liquid Black Holding Tank and Sensor Cleaner
Commando liquid provides a high-powered, advanced solution for deep cleaning and sensor restoration. This scientifically developed formula contains natural enzymes that easily maintain holding tanks with heavy build-up. Now available in a user-friendly 32oz liquid formula.
CMDOLQ32 Commando 32 oz Liquid, Case (8/cs)
CMDOLQ32CA Commando 32 oz Liquid, Dual Language, Case (8/cs)
Elemonate Liquid Grey Water Deodorizer
Elemonate tackles tough grey water tank odors with ease and efficiency. It is now offered in a 32oz liquid option for enhanced usability, ensuring your grey water tanks remain fresh and odor-free.
ELEMLQ32 Elemonate 32 oz Liquid, Case (8/cs)
ELEMLQ32CA Elemonate 32 oz Liquid, Dual Language, Case (8/cs)
Fresh-Pak Holding Tank Treatment
An all-new drop-in addition to our premium line that offers an easy-to-use, high-performance solution for holding tank treatment. It comes in a convenient 30-pack, perfect for effortless maintenance of tank hygiene.
FRESHPAK30 Fresh-Pak, 30 Pack, Case (8/cs)
FRESHPAK30CA Fresh-Pak, 30 Pack, Dual Language, Case (8/cs)
RV/Marine Wash & Wax
Our premium solution combines washing and waxing in one easy step. The high-foam, deep-cleaning formula uses advanced polymer technology, leaving a brilliant, long-lasting shine. Available in 32oz, 64oz, 1-Gallon, and 5-Gallon sizes.
WALWW32 RV/Marine Wash & Wax, 32 oz, Case (8/cs)
WALWW64 RV/Marine Wash & Wax, 64 oz, Case (8/cs)
WALWW1G RV/Marine Wash & Wax, 1-Gallon, Case (4/cs)
WALWW5G RV/Marine Wash & Wax, 5-Gallon, Single (1)
WALWW32CA RV/Marine Wash & Wax, 32 oz, Dual Language, Case (8/cs)
WALWW64CA RV/Marine Wash & Wax, 64 oz, Dual Language, Case (8/cs)
WALWW1GCA RV/Marine Wash & Wax, 1-Gallon, Dual Language, Case (4/cs)
WALWW5GCA RV/Marine Wash & Wax, 5-Gallon, Dual Language, Single (1)
Walex is committed to delivering premium, versatile products that align with your unique preferences and needs. Our expansion reflects our dedication to innovation and our mission to offer comprehensive solutions for every holding tank and cleaning challenge.
A comprehensive guide to choosing a deodorizer
Selecting the best deodorizer to use in your portable restroom or restroom trailer holding tank is crucial. You service your units regularly to create a superior impression, but deodorizer is the agent that works around the clock to preserve that environment. Keep reading to discover which deodorizer will set you apart from the competition.
Know your options
There are many types of deodorizer from which you can choose: liquid or pre-portioned drop-in, different chemistries (formaldehyde-based, formaldehyde-free, or natural), and various formula strengths. Many factors influence your decision: usage, climate, frequency of service, and even personal preference.
Traditional liquid or pre-portioned drop-in?
There are different benefits to liquid deodorizers and portion-control drop-ins, so choosing between them is often a matter of preference. The packets remove the guesswork from adding deodorizer because no measuring is required. And while containers like the Walex EZ-Squeeze Bottles allow greater accuracy when using liquids, you're still less likely to spill or overuse a drop-in packet.
One advantage of liquids, however, is the variety offered. Walex portion control drop-in packets are available in three strengths: Porta-Pak Max, Porta-Pak, and Porta-Pak Express, while Walex liquid deodorizer is available in nine varieties—three formaldehyde options and six formaldehyde-free choices. Liquids can also be made in any of Walex's 24 fragrances, whereas packets only come in certain fragrances.
Formaldehyde-free or Formaldehyde-based?
Liquid deodorizers are available in two chemistries: formaldehyde-based and formaldehyde-free. Walex's line of liquid deodorizers includes three formaldehyde-based products (PT-615, PT-600, and PT-60 Pre-Mix) and six formaldehyde-free products (PT-50 Supreme, Endure, Advantage, Contender, PT-500, and Pre-Mix).
In our industry's early days, formaldehyde was the main odor-eliminating ingredient in deodorizers. However, some states have since banned formaldehyde, so Walex's research and development team created equally effective formaldehyde-free deodorizers.
Formaldehyde-free products control odors for a longer period of time. If you tested the products side by side, formaldehyde would be more effective initially, emitting a powerful chemical odor. But because it is gas, it will evaporate after three to six days, depending on temperatures. The formaldehyde-free products continue providing odor control longer using the modern technology developed by Walex R&D chemists, and they’re safer to use.
What strength of product do you need?
The final decision you must make is the product concentration to order, which depends on your climate, usage, and frequency of service.
If you're in a hot climate or your units get heavy usage, the best drop-in is Porta-Pak MAX, a potent formula with 50% more dye, 50% more odor control, and double the fragrance of the original Porta-Pak. Your best liquid options are PT-50 Supreme, Endure, PT-615, or PT-600.
If you're in a warm climate or your units get moderate usage, choose Porta-Pak for your drop-in or Advantage or Contender for your liquid.
During the cold winter months, you could switch your drop-in to Porta-Pak Express, a smaller dose of formula. You can stick with Contender for your liquid or choose a ready-to-use product like PT-500.
Porta-Pak Express is also an economical option for outdoor events where units get heavy usage but are serviced daily.
When in doubt, opt for a more concentrated formula. The benefits of investing in odor control far outweigh the relatively small cost increases.
If you still have questions about which deodorizer best fits your needs, the odor control experts at Walex are here to help. Give us a call at 910-371-2242.
Can You Use RV Grey Tank Deodorizer in Your Home Drains?
Can You Use RV Grey Tank Deodorizer in Your Home Drains?
Quick Answer: Yes. An enzyme-based grey tank deodorizer designed for RV use can also help freshen home sinks, shower drains, and garbage disposals by breaking down grease and organic buildup.
What Is a Grey Tank Deodorizer?
A grey tank deodorizer is formulated for the RV tank that collects water from sinks and showers. These tanks accumulate soap residue, grease, food particles, and organic sludge—all of which can produce unpleasant odors over time.
Elemonate is a quick-dissolving tablet that releases digestive enzymes to break down odor-causing buildup while leaving behind a fresh lemon scent.
Can You Use Grey Tank Tablets in Household Drains?
Yes. The same types of organic residue that cause odors in RV grey tanks—grease, food scraps, and greywater buildup—can also accumulate in home plumbing systems.
Using an enzyme-based deodorizing tablet in your kitchen sink, bathroom drain, or garbage disposal can help neutralize these odors.
How to Use an Enzyme Deodorizer in Home Sinks
- Drop one tablet directly into the sink or disposal.
- Run water for several seconds to help dissolve it.
- Allow the enzymes to coat the drain lines.
The enzymes begin breaking down organic buildup while freshening the drain.
Is It Safe for Plumbing and Septic Systems?
Enzyme-based drain treatments are generally safe for pipes because they do not rely on harsh corrosive ingredients. They work by accelerating natural digestion rather than chemically stripping residue.
Because the formula uses natural enzymes, it is also compatible with septic systems and will not disrupt beneficial bacteria.
When Should You Use a Drain Deodorizer?
- If your sink emits a foul odor
- After cooking greasy meals
- If your garbage disposal smells
- As preventative maintenance for drains
Bottom Line
An enzyme-based grey tank deodorizer isn’t just useful in your RV—it can also help maintain fresher-smelling home drains. By targeting grease and organic sludge at the source, it provides safe and effective odor control.
Happy Adventuring!
How Much Deodorizer Should You Use in a 2.5- or 5-Gallon Porta-Potty?
How Much Deodorizer Should You Use in a 2.5- or 5-Gallon Porta-Potty?
Quick Answer: For cassette toilets or portable potties (2.5–5 gallons), use one full drop-in deodorizer packet per tank. Add the correct amount of water to ensure proper dissolution and effective odor control.
Can You Use RV Tank Deodorizer in a Cassette Toilet?
Yes. Even though many deodorizers are designed for larger black holding tanks, they can also be used in smaller systems like cassette toilets and portable potties commonly found in van conversions and camper vans.
Products such as Porta-Pak come in water-soluble packets, which means there is no need to open or measure the product. Simply drop the entire packet into the tank.
How Many Packets Should You Use?
Always use one full packet. Do not cut or open the packet. The water-soluble casing is designed to dissolve completely once added to the tank.
How Much Water Should You Add?
Water is essential for proper deodorizer performance. It helps dissolve the packet and ensures waste stays below the waterline so the treatment can work effectively.
- 5-gallon tank: Add ¾ to 1 gallon of water
- 2.5-gallon tank: Add approximately ½ gallon of water
The deodorizer can only treat the waste it contacts, so adequate water is critical for odor control and breakdown.
Does Deodorizer Help Break Down Waste?
In addition to controlling odors, many drop-in treatments help break down waste and toilet paper, making the tank easier to empty and clean.
Best Practices for VanLife and Portable Toilets
- Always add water before use
- Use one full packet per tank
- Empty when near capacity for better flow
- Rinse thoroughly after dumping
Need Help? Call 910-371-2242 with any questions about proper product usage.
Happy Adventuring!
How Often Should You Add Deodorizer to Your RV Black Tank?
How Often Should You Add Deodorizer to Your RV Black Tank?
Quick Answer: Most RV owners should add one drop-in deodorizer packet every time they dump their tank—typically every 5–7 days for two people in moderate weather. Always add treatment immediately after emptying and refilling the tank.
How Long Does One Bag of RV Deodorizer Last?
Usage depends on how many people are using the RV and how frequently the tank is dumped. As a general guideline:
- Two people in moderate temperatures: 1 packet every 5–7 days
- Higher usage or warmer climates: possibly more frequent treatment
- Lower usage: slightly longer intervals
If a bag contains 10 packets, it typically lasts about 5–10 weeks depending on usage.
When Is the Best Time to Add RV Tank Deodorizer?
The ideal time to add a new packet is immediately after dumping your black tank. Waiting until the tank reaches about 2/3 full before dumping ensures strong flow, which helps remove solids more effectively.
For enzyme-based treatments like Bio-Pak, allowing the tank to reach 2/3 full gives enzymes more time to liquefy waste and paper for easier dumping.
How Much Water Should You Add After Dumping?
Water is critical for odor control and proper digestion.
Recommended starting point:
- 1.25 gallons of water per 10 gallons of tank capacity
For a 40-gallon tank, that equals about 5 gallons of water before use.
Proper water levels allow waste and paper to sink below the waterline, where treatment works most effectively. Insufficient water can lead to hardened buildup (often called a pyramid plug) and persistent odors.
Why Sensor Accuracy Affects Odor Control
Knowing when your tank is 2/3 full depends on functioning sensors. If your sensors give false readings, you may dump too early or too late, which can affect odor control and tank health.
If sensors become inaccurate, use a deep-clean treatment like Commando to remove residue from tank walls and sensor probes.
How to Restore Sensor Function
- Empty the tank.
- Add one Commando packet.
- Fill the tank above sensor level.
- Let sit for 12–24 hours (longer if needed).
- Dump and rinse.
This process helps liquefy residual buildup, lubricate valves, and restore accurate readings.
Best Practices for Odor-Free RV Travel
- Dump at 2/3 full
- Add deodorizer immediately after dumping
- Use adequate water
- Monitor sensors regularly
- Perform periodic deep cleanings
Bottom Line: Consistent treatment, proper water levels, and accurate sensors are the keys to keeping your RV toilet odor-free.
Happy Adventuring!