Cutrine Plus Liquid Algaecide 1 gal

Bulk discount rates

Below are the available bulk discount rates for each individual item when you purchase a certain amount

Buy 4 or above and get $4.00 off
Cannot ship to AK, CA, CT, DE, HI, MA, ME, NJ, NY, RI, VT, WA or Canada

Cutrine Plus Algaecide 1 gallon 

Cutrine Plus is designed to control bottom growing string algae / filamentous algae, green water / planktonic algae, and chara

EPA-approved for use in lakes and potable water reservoirs, farm fish ponds and fish hatcheries.

Cutrine Plus effectively controls a broad range including:

  • Planktonic Algae (suspended)
    • Cyanobacteria (mycrocystis, ananbaena, & aphanizomenon)
    • Green Algae
    • Golden Algae
  • Filamentous Algae (mat-forming)
    • Spirogyra
    • Cladophora
    • Ulothrix
  • Benthic Algae (bottom-growing)
    • Chara
    • Nitella

Expect to see results within 7-10 days. As string algae dies, it releases from the bottom of the pond. You will see floating mats of brown algae appear in the pond. This can be removed with a pond rake or can be digested naturally with Muck Remover beneficial bacteria.

Unless steps are taken to reduce the overall nutrients in the pond, multiple applications may be needed for a full season of control.   

How to use Cutrine Plus Liquid:

Dilution rate for Cutrine Plus is 9:1. For 1 gal of Cutrine, mix 9 gal water. For 1 qt Cutrine, mix 2.25 gal water. Spray directly on affected areas. 3 gallon Sprayer sold here

Only treat up to half of the pond surface, waiting 10 to 14 days before treating the second half. Treatment of algae can result in oxygen loss from decomposition of dead algae.

Use Pond Dye after Cutrine Treatment to limit new algae from returning to your pond.

Cutrine Dosage Rates

Dosage Rate Per Treatment*

2,000 sq ft 5,000 sq ft 10,000 sq ft 40,000 sq ft
32 oz Cutrine
2 gal Water
4 oz Plex Mate
80 oz Cutrine
4 gal Water
8 oz Plex Mate
1.25 gal Cutrine
10 gal Water
20 oz Plex Mate
5 gal Cutrine
40 gal Water
80 oz Plex Mate

*All 3 ingredients are tank mixed together before spraying

When is the best time for treatment of algae?

Cutrine Plus works best when applied to water that is above 60 degrees. Treat early on a clear sunny day for best results.

Application Rate for Cutrine Plus:

1.8 gal treats 1 acre-foot of water for medium density string algae (Treats approx 8,000 sq ft in 3 ft of water)

1 acre-foot = 1 acre of water, 1 foot deep.  For example:  A 1 acre pond with an average depth of 6 feet contains 6 acre-feet of water. 

 Cutrine Plus Granular can be used as an alternative for spot treatment of bottom growing algae or for bottom growing algae in deep water.

 Full Cutrine Plus Liquid Label and Instructions

Will this kill my pond scum? 

A number of vegetation types fall into the category of pond scum. Not all surface films are algaes. Here is a helpful source to determine what your "scum" is-

Green Pond Scum

Water Restrictions: NONE

Shipping Restrictions: Cannot ship to AK, CA, CT, DE, HI, MA, ME, NJ, NY, PR, RI, VT, WA or Canada

Other Restrictions: Do not use in ponds with Koi, Goldfish, or Trout unless carbinate hardness levels are above 50ppm.

Do NOT use in garden ponds.