SonarQ

SePRO · EPA Reg 67690-3 · Herbicide ✓ Last verified 2026-05-30

Key facts From the EPA

Registration, signal word, restricted-use status and approved use sites are sourced from the U.S. EPA pesticide registry. EPA Reg. No. 67690-3. View this product's label on the EPA ↗ (EPA copy accepted February 3, 2023)

Active ingredient Pending extraction

Manufacturer SePRO

EPA registration 67690-3

Category Herbicide

Target pests Aquatic Weeds, Vegetation

Safety & handling WARNING

According to the label From the product label

These application details were read from this product's label by our system to help you in the field. The label is the law — always confirm rates, sites and restrictions against the actual product label before mixing or applying. View the full label →

Sonar SRP is a selective systemic herbicide used for the management of aquatic vegetation in fresh water ponds, lakes, reservoirs, potable water sources, drainage canals, irrigation canals, and rivers. The active ingredient is Fluridone at a concentration of 5.0%. It is designed to control a variety of aquatic plants, including submerged plants like bladderwort, common coontail, and watermilfoil, as well as certain floating and emergent plants. The product is absorbed by plant shoots and hydrosoil by the roots. It is a slow-release formulation, meaning concentrations may be lower at certain points due to the nature of the product. When using this product, it is critical to maintain the target concentration in the water for as long as possible. Users should be aware that rapid water movement or dilution can reduce effectiveness. The label provides specific application rates based on desired parts per billion (ppb) concentrations, with a maximum total application rate of 90 ppb in ponds/canals/rivers and 150 ppb in lakes/reservoirs per annual growth cycle. Always consult an aquatic specialist for specific plant susceptibility and management strategies.

Application rates & sites 1

Target pest	Indoor / Outdoor	Where on site	Rate	Dilution	Infestation level	Notes
Aquatic vegetation (including bladderwort, coontail, watermilfoil, etc.)	Both	Ponds, lakes, reservoirs, potable water sources, drainage canals, irrigation canals, and rivers	45 to 90 ppb (ponds/canals/rivers) or 16 to 150 ppb (lakes/reservoirs)			Selectivity varies by plant species; some plants are controlled, partially controlled, or not controlled.

Mixing & dilution 1

For	Where	Amount	Per	Finished strength	Notes
Aquatic vegetation				45-90 ppb or 16-150 ppb	Rates are calculated to achieve desired ppb concentrations in the water body.

PPE required Avoid breathing of dust or contact with skin, eyes or clothing. Wash thoroughly with soap and water after handling. Remove contaminated clothing and wash before reuse.

Timing & weather

Apply according to plant growth stages; results appear in 7 to 10 days.
Rapid water movement or heavy rainfall can dilute product and reduce effectiveness.

Use restrictions 5

Do not use in tidal saltwater.
Do not use in waters less than 2 feet deep (except under specific FIFRA Section 24(c) registrations).
Do not use in hydroponic farming unless water intake has been verified to be below 1 ppb.
Do not use in greenhouse or nursery plant irrigation unless water intake has been verified to be below 1 ppb or 5 ppb depending on plant type.
Maximum annual application: 90 ppb in ponds/canals/rivers; 150 ppb in lakes/reservoirs.

Documents

📄 Label 📋 SDS

Label SDS

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Versions 2026-05-30 2026-05-27 · default

Label text

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Reference only. Always read and follow the most current EPA-approved label on the product container. State and local restrictions may apply that are not reflected in this digitised copy. Verify the EPA registration number and revision date before use.