Our #1 Pick
For a basement, attic or crawl space after the mold has been removed and the moisture fixed: the Concrobium fogger with a gallon of Concrobium Mold Control. For a musty small room where the growth is already gone and you want the airborne particulates settled: a Mold Bomb can — understanding that it treats the air and the smell, not the colony.
Quick answer
A mold fogger is a finishing tool: after mold has been physically removed and the moisture fixed, a fogger coats every surface of an enclosed space — a basement, attic or crawl space — with a fine mist that is hard to apply by hand. The Concrobium Mold Control Fogger is a cold fogger that applies Concrobium's EPA-registered, bleach-free solution and is the one to use for that job. The BioCide Mold Bomb is a 6 oz aerosol for about 100 square feet that, per its maker, grounds airborne particulates and odor — it is not an EPA-registered biocide and does not kill surface mold. Neither removes mold, neither reaches growth inside drywall or wood, and EPA does not recommend biocides as a routine part of mold cleanup. Fog after removal, never instead of it.
Reviewed by Marcus ReedIICRC Certified WRT
Updated August 30, 2026 · Independent expert review — no sponsored placement
BioCide Mold Bomb Particulate
Up to 100 sq ft per can (manufacturer)
1 of 3
Affiliate disclosure: HearthDry earns commissions from Amazon Associates & Sylvane via Commission Junction. Prices verified July 2026.
Every product is evaluated on three dimensions by Marcus Reed, our IICRC-certified Water Restoration Technician. Scores are based on field use during actual restoration jobs — not manufacturer spec sheets.
Value
Price vs. performance ratio — does the unit justify its cost for typical water damage jobs?
Performance
Real-world drying speed, moisture removal rate, and reliability over 72-hour continuous runs.
Ease of Use
Setup time, control clarity, portability, and how easily a non-professional can operate it.
Full Reviews
Each review reflects hands-on field testing. Scores out of 10.
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Linked to the current Amazon listing — price and availability change; verified 30 Aug 2026
Quick Verdict
The right finishing tool for enclosed spaces — after the real work, not instead of it.
Score Breakdown
Key Specs
Type
Cold (ULV-style) fogger, electric
Solution
Concrobium Mold Control — sold separately (EPA-registered, no bleach, no VOCs)
Flow
Adjustable output for room size
Spaces
Basements, attics, crawl spaces, garages, storage, enclosed rooms
Reusable
Yes — refill and reuse
Solution refill
1 gallon Concrobium (ASIN B009AN7Y2U)
Pros
Cons
Best For
Treating the exposed framing of a basement, attic or crawl space after cleanup and moisture correction
Expert Note
Marcus Reed · IICRC Certified WRT · 15 yrs experience
“This is what fogging is for: the last pass over a crawl space or attic after the moldy material is out and the moisture is fixed, coating every surface at once. Used before removal, it wets a colony that is still fed by water and changes nothing.”
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Quick Verdict
An air-settling can, not a mold killer — fine for the smell after the work, wrong as the work.
Score Breakdown
Key Specs
Type
Aerosol total-release can
Can size
6 oz
Coverage
Up to 100 sq ft per can (manufacturer)
EPA registration
Not an EPA-registered biocide (manufacturer's statement)
Action
Particulate suspension — grounds airborne particulates and odor
Vacate
Two to four hours per label
Pros
Cons
Best For
Clearing the air and odor in a small room after the mold has already been removed
Expert Note
Marcus Reed · IICRC Certified WRT · 15 yrs experience
“Read the manufacturer's own site before buying: it says plainly that the product grounds particulates and does not kill surface colonies. That makes it an air-and-odor treatment, which has a place — after removal — and not a remediation product.”
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Quick Verdict
Buy this with the fogger — it is the part that actually treats the surface.
Score Breakdown
Key Specs
Type
Mold control solution — EPA-registered
Formula
No bleach, no ammonia, no VOCs; odorless
Use
Fogger, sprayer, or wipe-on
Action
Crushes spores as it dries and leaves an antimicrobial barrier
Surfaces
Wood, drywall, concrete, masonry, fabric
Size
1 gallon
Pros
Cons
Best For
The refill for the fogger, and spray-on treatment of cleaned framing and masonry
Expert Note
Marcus Reed · IICRC Certified WRT · 15 yrs experience
“A gallon is the honest running cost of fogging. Applied to cleaned, dried surfaces it leaves a barrier; applied to a wet wall it leaves a wet wall.”
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What to know before you buy — written from real restoration job experience.
A fogger turns a liquid into a fine mist that settles on every surface in an enclosed space — the top of a joist, the back of a stud, the underside of sheathing — where a sprayer and a rag cannot reach. Used with an EPA-registered mold-control solution, it treats those surfaces and leaves a residual barrier. That is a genuine job in a crawl space, attic or basement after cleanup. It is the only job fogging does.
It does not remove mold. Dead mold is still allergenic, which is why EPA's guidance centres on removal and moisture control, not on killing mold in place, and why EPA does not recommend biocides as a routine part of mold cleanup. It does not reach mold inside drywall, insulation or wet wood — those materials are removed. And it does not fix the moisture that grew the colony, so a fogged space with a leak grows the same mold back.
The Concrobium machine fogger applies a registered solution you choose, in the quantity you choose, and is reused. The Mold Bomb can is a fixed 6 oz total-release aerosol for about 100 square feet that, by its manufacturer's own description, grounds airborne particulates and odor rather than killing colonies. They are different products for different moments: the fogger for treating surfaces after removal, the can for settling the air in a small room afterwards.
Nobody in the space during fogging; a respirator (P100 or an organic-vapour cartridge as the product label specifies) for the person applying it; pilot lights and ignition sources off for aerosols; the space closed for the label's dwell time and then ventilated. Read the label of the solution, not just the fogger — the solution is what you are breathing.
Find and fix the water. Remove moldy porous material and HEPA-vacuum and clean the hard surfaces. Dry the space — a moisture meter on the wood below about 16%. Then fog the exposed surfaces. Then keep the space dry with a vapour barrier and a dehumidifier. Fogging is step four of five; sold as step one, it is the most-refunded product in the category.
How HearthDry evaluates equipment
Every product on this page has been evaluated by Marcus Reed, a 15-year IICRC Water Restoration Technician (WRT) who has worked on hundreds of residential and commercial water damage jobs. Products are scored across three weighted dimensions: Value, Performance, and Ease of Use.
Test Conditions
HearthDry maintains editorial independence. Affiliate commissions do not influence rankings — the #1 pick is always the best product for most homeowners, not the highest-commission product. Prices are verified monthly and updated when they shift more than 10%.
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