PYRANHA 1-10 HP Concentrate Refill 2.5 Gallon - Barn Fly Control

In this review the PYRANHA 1-10 HP Concentrate Refill 2.5 Gallon is evaluated for large barns and automatic spray systems; it is aimed at horse owners and barn managers who need dependable, continuous fly control. The bottom line: this concentrate is best for those running a 55 gal automatic spray system who want a product developed over decades using premium pyrethroids that delivers fast knockdown and lasting protection. It stands out as a refill choice when consistent, professional-grade repellency matters most.

Key Features

• Premium formulation: Developed over 50 years using premium pyrethroids, it provides a high-performance foundation for automatic spray systems.
• Broad-spectrum repellent: Kills and repels horn flies, horse flies, stable flies, face flies, deer flies, mosquitoes and midges for comprehensive barn protection.
• Fast action: Designed to give quick knockdown so animals feel relief soon after application by the automatic sprayer.
• Long-lasting effects: The formulation offers sustained deterrent action to help keep barns clearer between spray cycles.
• Made for automatic systems: Specifically made to be used as a refill in 55-gallon automatic fly spray systems, simplifying large-barn maintenance.
• Trusted in equestrian settings: Backed by decades of use, it is a familiar product to professionals who manage horse comfort and barn hygiene.

Who It's For

This concentrate is for horse owners, stable managers, and agricultural professionals who operate or plan to use a 55 gal automatic fly spray system and need reliable daily fly control. It suits large barns, boarding facilities, and any operation where hands-off, consistent dosing from a bulk refill keeps chores manageable and animals comfortable.

Those who keep only a couple of horses, prefer hand-sprays, or cannot use pyrethroid-based insecticides for safety or regulatory reasons should look elsewhere; smaller bottle formats or non-chemical control options will be more appropriate for limited or sensitive use cases.

Pros & Cons

Pros

• High-performance concentrate based on long-term development and premium pyrethroids for reliable control.
• Broad-spectrum action covers the common biting pests found in barns, reducing visible fly pressure.
• Formulated for 55 gal automatic spray systems so refilling and continuous operation is straightforward.
• Fast knockdown with lasting effects helps maintain animal comfort and reduce nuisance pests.

Cons

• Designed specifically for 55 gal automatic systems, so it is not convenient for small-scale or handheld use.
• Contains pyrethroid chemistry, which some users may avoid for environmental or sensitivity reasons.

Specifications

Our Verdict

For large barns and facilities already using a 55 gal automatic spray system, the 1-10 HP Concentrate 2.5 gallon refill is a practical, professional choice that delivers broad-spectrum, fast-acting protection. Its formulation and system fit make it good value for those who need consistent, hands-off fly control; smaller operations or users avoiding pyrethroids should consider alternatives.

Frequently Asked Questions

Can this be used directly in automatic spray systems?
Yes, it is specifically formulated as a refill for 55 gal automatic fly spray systems.

What pests does it control?
It targets horn flies, deer flies, stable flies, horse flies, face flies, mosquitoes and midges.

Is this suitable for small barns or handheld sprayers?
It is optimized for large 55 gal automatic systems; small barns or handheld use may be better served by smaller, purpose-packaged products.