In 2019, Steve Starcher (now with Millicare) and I created a suggested procedure on dealing with Ice Melt issues, with his help again, we have created an updated version.
Carpet in the commercial environment is a great choice, but winter weather presents a unique set of challenges. When de-icing agents are tracked indoors, they don’t just sit on the surface; they most often embed themselves into the pile of fibers. Understanding how to neutralize and remove these Ice Melt products is essential for maintaining appearance and extending the lifespan of your carpet.
The Science of the Problem
De-icing agents—primarily calcium chloride, sodium chloride (rock salt), potassium chloride, magnesium chloride, and urea—are highly hygroscopic. This means they naturally attract and retain moisture from the air.
On a carpet, this creates several significant challenges:
- Rapid Soil Redeposition: These agents create a “sticky” fiber that attracts dirt like a magnet. Even after vacuuming, the carpet may look soiled again within hours.
- Fiber Damage: Salt crystals are abrasive. When walked upon, they act like tiny saws, cutting and fraying the carpet fibers.
- Staining: some ice melts have dyes in them to allow the public to see that they have been applied, if left untreated, possible staining could occur.
Understanding what has happened
Most ice melts used around the outside of facilities are in the form of a dried, hard material that is distributed (often way too heavy) on the driveways, parking lots and sidewalks. When they come in contact with moisture (snow and ice) they will begin to dissolve into a liquid (brine), creating a chemical reaction interrupting the liquid’s ability to form ice crystals. As this liquid is moved throughout the building and is deposited, it starts to dry, turning back to its original state of a solid. The typical water rinse extraction often isn’t enough for heavy salt buildup because the salt can re-crystallize as the carpet dries.
Before You Begin
Ice melts unchecked can migrate throughout a facility, from the vestibule to under a desk on the 30th floor. So, before beginning the removal process, identification of fiber type and carpet construction type so proper chemistry and agitation can be determined is critical.
- Identify the Fiber Type: Determine whether the carpet is synthetic (nylon, polyester or olefin) or natural (wool). Most commercial carpets are synthetic, but wool requires tested and approved chemistry along with the least aggressive agitation as possible.
The Process
As we just talked about, Ice Melts started out as a solid, dissolved and then migrated throughout the facility via foot traffic and deposited on the carpet, where it dried and became a solid again.
- Dry particulate removal: a Counter Rotating Brush Machine (CRB) or Pile Lifter is an essential tool for the process of removing ice melt from carpet. This action dislodges the dried ice and brings it to the surface.
- Thorough Dry Vacuuming: once the dried ice melt is brought to the surface, the use of a high-efficiency HEPA vacuum with agitation should be used to remove as much dry salt crystal as possible before getting the carpet wet.
Steps 1 and 2 may need to be repeated, depending on the amount of ice melt deposited in the carpet.
- Pre-Conditioning: Depending on the type of ice melt used outside, either an acidic based cleaner (for calcium based) or an alkaline based cleaner (for magnesium based) can be applied to the carpet
- Agitation: Use a Counter-Rotating Brush (CRB) machine to spread chemistry throughout the carpet pile, ensuring it reaches the base of the fibers where ice melt will settle.
- Dwell Time: Allow the solution to dwell for 10-15 minutes. Because ice melts are hygroscopic, they need time to fully dissolve into the liquid solution for total extraction.
- Water Rins Extraction: Flush the carpet using an extractor and wand for best results. The use of an acidic rinse in the freshwater tank can assist to neutralize any residues that remain.
- Enhanced Drying: Use air movers to rapidly dry the area. This is essential to make sure all ice melt has been removed, if not all removed, “wicking,” (Wicking is the process where liquid moves through a material via capillary action, it can occur from down to up, or side to side) can happen, and any residual ice melt may be deposit on the surface during the drying process.
Proactive Preventative Maintenance
To stop this cycle of damage, implement a “Defense-in-Depth” strategy:
- The 3-Zone Matting Rule: Invest in a high-quality walk-off system.
- Scrape (Outside): Coarse mats to knock off heavy snow.
- Scrub (Vestibule): Transition mats to remove most brine.
- Wipe (Interior): High-absorbency mats to dry the soles of shoes.
This 3-zone approach can capture up to 80% of contaminants before they ever touch your carpet.
Recommendations:
Extraction equipment with a minimum of 200 psi water pressure and a minimum of 190” of lift on the vacuum.
Use XL Crystallizing Acid Rinse in the freshwater tank to rinse tank. This will neutralize the salts and will crystallize any remaining particulates remaining in the carpet.
use slow “wet pass” wand strokes. This allows saturating the area (reliquefying the remaining ice melt to be rinsed away)
Increased Winter Frequency: During snowy months, double the frequency of vacuuming in high-traffic zones. Removing salt while it is dry is 10 times cheaper than removing it once it has been dissolved and tracked in.
Safety Transitions: Always place “Wet Floor” signs at the transition points between carpet and hard flooring. Damp shoe soles on a tile floor are a major slip-and-fall liability.
By treating ice melt as a chemical soil rather than just “dirt,” you can preserve your facility’s professional image and avoid the costly “dingy winter look.”
