Why Methanol Isn’t the Most Popular Winterization Solution

Photo courtesy Joan Castañer, Alkirent Servi SL

When portable sanitation companies look for cheap winterization solutions, methanol can occasionally top the list. It’s effective at sub-zero temps and mixes easily with water. But methanol isn’t the most popular antifreeze method for portable restroom units because it’s highly combustible and toxic to breathe. For these reasons and others, many PROs prefer alternative methods like salt brine. Let’s explore how methanol works and why some business owners use it, then review the drawbacks.

Winterizing with Methanol

Methanol is a toxic alcohol that lowers the freezing point when added to water. Products like windshield washer fluid, antifreeze, and varnishes may contain methanol. While methanol isn’t the most popular option for winterizing flushing units and standard units, it works in a pinch when handled correctly.

Here’s why some PROs choose methanol:

• Ease of use: Most hardware stores sell methanol, which mixes easily with water and can be added directly to tanks. Preparing units with methanol rather than salt brine can be quicker when an unexpected freeze is coming.
• Effectiveness: At the minimum amount of 6.4 ounces per gallon, methanol protects tanks from freezing down to 28⁰ F, and the maximum of 42.2 ounces per gallon provides protection down to -9⁰ F.
• Versatility: Methanol is non-corrosive, doesn’t leave a residue, and works in various outdoor equipment. For these reasons, PROs might choose methanol when winterizing portable restrooms.

Drawbacks of Using Methanol

Methanol is a hazardous material that’s highly poisonous, flammable, and harmful to the environment. Inhaling fumes, swallowing it, or getting it on your skin can be deadly or cause a range of severe health effects. A spark or open flame while using methanol can cause an explosion. Adding more than 33% methanol by volume makes the tank water flammable — a catastrophe waiting to happen.

Before attempting to use methanol as a winterization solution, review your safety procedures and make sure employees wear personal protective equipment (PPE). Lastly, not all waste treatment plants accept methanol. Improper disposal or spills could require reporting to the fire department or state environmental protection agency.

Popular Winterization Solutions for Portable Restrooms

Given these downsides, many PROs turn to alternative winterization solutions. The best method for your portable restroom business depends on your climate, equipment, and budget. Have a plan and give your team winterization tips so you’re ready to tackle any situation. For instance, PROs with stainless or aluminum tanks and corrosion-resistant fittings can use a rock salt brine solution to safeguard against freezing temps down to 0⁰ F.

A de-icing salt or magnesium chloride (MgCl2) is a bit more expensive but defends against harsh temperatures of -26⁰ F. De-icing flakes or pellets are another simple solution because drivers can add them directly to urinals and toilets after servicing.

Prevent Freezing This Winter

As you prepare for the big chill, consider the trade-offs of each winterization solution. If you go with methanol, have proper safety protocols in place, including employee training and warning signs for portable restroom units. And if you choose an alternative, make sure it’s compatible with your equipment and temperatures.

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