Harris 16 Oz. Ready To Use Powder Boric Acid Roach Killer

Harris 16 Oz. Ready To Use Powder Boric Acid Roach Killer kills cockroaches within 72 hours using 99% boric acid with 1% lure/attractant. The powder formula provides residual control for weeks when dry — critical for Montana’s dry climate where humidity won’t compromise the active ingredient. It’s the workhorse of commercial pest control.

This EPA-registered powder (No. 3-10) targets the roaches that plague multi-unit housing and food service operations across Montana’s urban centers. The included food-grade attractant lure draws roaches out of wall voids and equipment cavities where sprays can’t reach. For contractors managing pest control in apartment complexes, restaurants, or warehouses, this product delivers professional-grade control without scheduling around occupancy.

Active Ingredient Performance

The 99.0% boric acid concentration sets the professional standard. This isn’t diluted consumer-grade powder. Kills within 72 hours of contact — roaches walk through it, ingest it during grooming, and die. The 1.0% lure/attractant component makes the difference between powder that sits ignored and powder that actually contacts pests.

Long-lasting residual control as long as the powder remains dry and undisturbed. Montana’s low humidity works in your favor here. Unlike coastal markets where powder clumps within weeks, this stuff stays active in wall voids and crawl spaces through entire seasons. The non-caking formula that remains free-flowing means it keeps working even after temperature swings.

Specification	Value
Active Ingredient	99.0% Boric Acid
Inert Ingredients	1.0% (Includes Lure/Attractant)
Net Weight	16 oz (1 lb)
EPA Registration	No. 3-10
Time to Kill	Within 72 hours of contact
Formulation	Ready-to-use powder (dust)

Boric acid, including Harris’s product, does not affect cockroach eggs. Plan for follow-up applications when eggs hatch. This limitation means treating at 2-3 week intervals during active infestations — standard protocol for any boric acid product.

Application Precision and Professional Use

The 8-inch applicator transforms this from a shake-and-pray product into precision pest control equipment. Ready-to-use bottle with a ‘pro-applicator’ tip for precision dusting lets contractors place powder exactly where roaches travel — not all over surfaces where it becomes a nuisance.

Apply a light dusting (thin layer) to target areas using the puff applicator. Heavy piles actually reduce effectiveness — insects are less likely to walk through large piles of powder. The puffer design prevents over-application that wastes product and creates cleanup headaches.

Target areas for professional application:

• Behind and under appliances (refrigerators, stoves, dishwashers)
• Under sinks and along plumbing/drains
• Wall voids and dryer vents
• Inside pipe penetrations and cabinets
• Cracks and crevices in walls, floors, and cabinetry
• Along baseboards and window/door frames

Compliant for residential use in all 50 U.S. states. The product works in homes, schools, warehouses, restaurants, and garages — anywhere cockroaches establish themselves. For Montana’s food service industry meeting health department requirements, this EPA-registered solution provides documented pest control without chemical spray residues on equipment.

The odorless and non-staining properties matter for occupied spaces. No evacuation required. No lingering chemical smell that drives away customers or tenants. Apply it behind appliances in active kitchens without disrupting operations.

The Bottom Line

Made in the USA by P.F. Harris Mfg. Co., LLC, this powder delivers what contractors need: reliable roach control that works in Montana’s dry climate. The 99% boric acid concentration with lure attracts and kills, while the precision applicator prevents waste. At 4.1 stars across 604 Home Depot reviews, it’s proven effective in real-world applications.

For multi-unit housing managers dealing with roach migration between units, this provides barrier treatment that lasts. For restaurants meeting health codes, it offers documented EPA-registered control without spray contamination concerns. The powder stays active for weeks in Montana’s low-humidity environment — set it and check back next month.

Used as part of an integrated pest management plan, including exclusion and sanitation, this product handles the killing while you handle the prevention. Not magic dust — but it’s the foundation of professional roach control.

Frequently Asked Questions

Q: How long does the powder remain effective after application?

A: Long-lasting residual control as long as the powder remains dry and undisturbed. In Montana’s dry climate, properly placed powder can remain effective for weeks or even months. The key is keeping it dry — any moisture from leaks or spills will deactivate the boric acid.

Q: Does this product kill roach eggs?

A: No. Boric acid, including Harris’s product, does not affect cockroach eggs. You’ll need to reapply after eggs hatch, typically every 2-3 weeks during active infestations. This is a limitation of all boric acid products, not just Harris.

Q: Is it safe to use around pets?

A: EPA-registered for residential use with people and pets present when applied correctly. Keep treated areas out of reach of children and pets. Safe for use in homes with people and pets when you apply it to areas inaccessible to children/pets like deep cracks or behind large appliances.

Q: What pests does this kill besides roaches?

A: The product targets Cockroaches, Palmetto Bugs, Water Bugs, Silverfish, Other crawling insects. It’s primarily marketed for roaches but works on any insect that walks through it and grooms itself.

Q: How much area does a 16 oz bottle cover?

A: Coverage depends on application thickness. Apply a light dusting (thin layer) for best results — a 16 oz bottle treats numerous cracks and crevices in a typical commercial kitchen or multi-room apartment. Heavy application wastes product since insects are less likely to walk through large piles of powder.