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The Best Pond Algaecide of 2023 – Reviewed and Top Rated

After hours researching and comparing all models on the market, we find out the Best Pond Algaecide of 2023. Check our ranking below.

2,702 Reviews Scanned

SaleRank No. #1

API POND ALGAEFIX Algae Control 32-Ounce Bottle, FISHAQUARI (169G)

Contains one (1) API POND ALGAEFIX Algae Control Solution 32-Ounce Bottle
Effectively eliminates green water algae, string and hair algae, blanketweed algae and others
Controls green water to keep pond water clean and clear in ornamental ponds and water gardens
Use as directed to keep water safe for fish, pond plants, surrounding wildlife and pets
Dose every three days until algae is controlled and then treat weekly

SaleRank No. #2

API POND ALGAEFIX Algae Control 1-Gallon Bottle

Contains one (1) API POND ALGAEFIX Algae Control 1-Gallon Bottle; treats up to 38,400 U.S Gallons
Helps resolve algae problems and controls the formation of new algae; works fast; effectively controls most types of algae including green water (Chlorella), string and hair algae (Cladophora), blanket weed algae (Oedogonium) in ponds, koi ponds and fountains
This EPA-registered pond algaecide will not harm fish, plants, surrounding wildlife and pets when used as directed
Does not contain copper
Before use, make certain that the pond/fountain has vigorous aeration; thoroughly mix into pond/fountain water and disperse evenly; Repeat dose every three days until algae is controlled; dose weekly to keep pond or fountain clean and clear and to reduce maintenance

SaleRank No. #3

API POND ALGAEFIX Algae Control 16-Ounce Bottle (169B)

100% dedicated to performance and clean environment
Product tested and safe for salt or fresh water setups
Cleaner ponds and tanks equal longer fish and aquatic life
Age Range Description: Senior

SaleRank No. #4

API POND ALGAEFIX Algae Control 64-Ounce Bottle (FF-169D)

Contains (1) API POND ALGAEFIX Algae Control 64-Ounce Bottle; treats up to 19,200 U.S Gallons
Helps resolve algae problems and controls the formation of new algae; works fast; effectively controls most types of algae including green water (Chlorella), string and hair algae (Cladophora), blanket weed algae (Oedogonium) in ponds, koi ponds and fountains
This EPA-registered pond algaecide will not harm fish, plants, surrounding wildlife and pets when used as directed
Does not contain copper
Before use, make certain that the pond/fountain has vigorous aeration; thoroughly mix into pond/fountain water and disperse evenly; Repeat dose every three days until algae is controlled; dose weekly to keep pond or fountain clean and clear and to reduce maintenance

SaleRank No. #5

Cutrine-Plus Algaecide, 1 gal

Effective control of forms planktonic and filamentous algae
ALGAE CONTROL USED BY THE PROS - WORKS FAST: Visible reduction in algae growth 1 – 2 days after application. Shows fast results on most types of algae.
DOUBLE CHELATED FORMULA: Double chelated formula prevents the precipitation of copper with carbonates and bicarbonates in the water
RECOMMENDED USE: Lakes, potable water reservoirs, ponds, fish hatcheries and raceways, crop and non-crop irrigation conveyance systems (ditches, canals and laterals)
Ideal for algae on the surface or in the water column. Works in hard water.

Rank No. #6

CrystalClear Algae D-Solv Pond Algae Control, Fast-Acting EPA Registered Algaecide, Use in Fountains & Outdoor Ponds Containing Koi & Other Fish, Treats 46,080 Gallons, 1 Gallon

Highly Effective Algaecide: Fast-acting, broad-spectrum algae remover effective in controlling many different types of algae including green water algae, string or hair algae, and blanketweed.
No More Green Water: Perfect for controlling existing algae blooms and getting your pond back on track to being clean and clear. An easy-to-use alternative to draining and scrubbing your entire pond.
Will Not Harm Koi & Ornamental Plants: Algae D-Solv contains no copper and will not harm fish or decorative plants when used as directed. Before using algae treatment, ensure pond has aeration.
Easy Application: Apply 1 fl oz Algae D-Solv per 360 gallons of water. Once pond algae growth is under control, weekly doses will control algae growth and reduce pond maintenance.
Variety of Applications: A great algae maintenance solution for fountains, self-contained aquariums, backyard ponds, lined water gardens, and decorative ponds without any outflow.

SaleRank No. #7

Crystal Plex - Lake and Pond Algaecide Treatment - Liquid Copper Algaecide Kills and Prevents Various Types of Algae (Planktonic, Filamentous, Chara) - 1 Gallon Treats up to 1 Acre

Controls many types of algae such as filamentous, chara, planktonic and swimmers itch for a beautiful and safe pond all year long
When used as directed, Crystal Plex is 100 percent safe for humans, fish, livestock, pets, birds, swimming and irrigation
Not for use in Koi, Goldfish, or Trout ponds
Treat only a third to half of your pond at a time
One gallon treats 1 surface acre 1-3 ft deep

Rank No. #8

The Pond Guy InstaFix Algae Control, Outdoor Water Garden, Fountain & Birdbath Algae Solution, EPA Registered Liquid Algaecide, Control Green Water & String Algae, Bird, Fish & Pet Safe, 16 Ounce

Fast Acting & Easy to Use -- InstaFix Algae Control helps you win the algae battle, offering fast-acting, easy-to-use algae control. Simply pour liquid treatment evenly around the pond's edge.
EPA Registered Algaecide -- Control excessive algae blooms, green water, blanketweed, or string algae in your water garden or koi pond. Eliminate existing algae growth and control future algae growth.
Controls String Algae & Algae Blooms -- Algae remover works best in water well aerated by an aerator, waterfall or fountain. Use InstaFix to treat existing algae growth or once a week for maintenance.
Combats Green Water -- Eliminates planktonic algae that causes green water. Treatment is ideal for small outdoor ponds, water gardens, birdbaths, fountains, or other decorative water features.
Safe for Fish and Plants -- When used as directed, treatment will not harm plants, fish, koi, goldfish, birds, livestock or wildlife. Do not use with snails, shrimp, clams, crustaceans or mollusks.

SaleRank No. #9

EasyCare FounTec Algaecide and Clarifier, 8 oz. Bottle

Algaecide clears pond and fountain water
Safe for plants, birds, and wildlife
NOT safe for fish
Use in water features, indoors or out
Keep water free of mosquitos

Rank No. #10

CrystalClear AlgaeOff Pond & Water Garden Scum Cleaner, Waterfall & Rock Slime Remover, String Algae Killer, Green Stain Treatment, EPA Registered Algaecide, Plant, Koi Fish, Bird & Pet Safe, 8 lbs

Controls Algae in Ponds -- AlgaeOff algae remover works on contact! Utilizing the latest in oxygen technology to remove and kill string algae quickly and efficiently on rocks, streams, and waterfalls.
EPA Registered Algaecide -- AlgaeOff is a fast-acting EPA registered granular algae remover that works in seconds! In addition to string algae control, it removes foul odors.
Fast Acting, Works on Contact, Easy Application -- Simply sprinkle granular formula directly on areas covered in live algae. For a waterfall or fountain, turn off the water pump and apply treatment.
Kills Algae Fast -- Immediately removes & lifts string algae. A great solution for pond clean-outs, rocks, and liners. Use in large ponds and lakes with algae mats. Will not treat planktonic algae or Chara.
Will Not Harm Wildlife -- Does not contain copper! When used as directed, AlgaeOff is great for backyard ponds containing koi, goldfish, and grass carp. Will not harm animals when diluted in water.

Rank No. #11

Cutrine Plus Granulated Algaecide, 30 lbs

Rapid sinking granules for targeted delivery to bottom-growing algae
Visible reduction of algae growth 1-2 days
Chelating agents prevent the precipitation of copper with carbonates and bicarbonates in the water for longer activity
Stays active in the water longer than copper sulfate
Ideal for algae in deeper waters or bottom growing algae - use Cutrine Plus Algaecide (liquid) for algae on the surface or in the water column

Rank No. #12

Crystal Blue Copper Sulfate Algaecide - Granular Aquatic Grade Copper Sulfate for Pond Algae Control - 5 Pounds

99% Copper Sulfate Pentahydrate. To be used for large bodies of water, not small decorative ponds, water features, or pools.
Controls most species of algae like filamentous, string algae and swimmers itch. Copper Sulfate should be used as a pond algae treatment on actively growing algae in water temperature above 60F.
Most effective when cast out on top of thick floating algae mats. Be aware of how much vegetation you are treating at one time. Eliminating too much at once can deplete the oxygen levels too quickly for your fish.
Granular Copper Sulfate, 5 lbs
DO NOT use in bodies of water that include Koi, Goldfish, Trout, or Grass Carp. These types of fish are sensitive to copper sulfate products.

Rank No. #13

Tetra 77188 Algae Control Treats 36000 gallons, 101.4-Ounce

CONTROLS ALGAE: Liquid formula combats algal blooms that cause green water, string and hair algae and blanket weed.
FOR ORNAMENTAL PONDS & FOUNTAINS: Use only in fountains and ornamental ponds with synthetic liners.
SAFE FOR PLANTS & ORNAMENTAL FISH: Use with live plants and fish in ornamental outdoor ponds as directed.
USAGE: Use 25 mL for every 300 gallons of pond water.
TREATMENT: This 101.4 oz bottle treats 36,000 gallons.

Rank No. #14

Fountain Algaecide and Clarifier - 8oz - Kills and Inhibits All Types of Algae Growth, Formulated for Small Ponds and Water Features, Treats up to 8,000 Gallons

Fountain Algae Control Solution 8-Ounce Bottle. Also available in 32 oz. and 64 oz. bottles. DO NOT USE WITH FISH.
Effectively eliminates green water algae, string and hair algae, blanketweed algae and others. Non-hazardous, non-staining, and non-foaming when used as directed.
Controls green water to keep pond water clean and clear in ornamental ponds and water gardens.
Use only as directed to keep water safe for pond plants, surrounding wildlife and pets. Not safe for fish.
Dose every three days until algae is controlled and then treat weekly. Maintain by using .75 oz. of product per 1,000 gallons of water every 5 days.

Rank No. #15

TotalPond A20036 Pond Algaecide, 32-Ounce

Fast acting, will stop algae growth in pond water
Will not harm fish or live ornamental plants
Helps balance pond water
32-Ounce bottle

SaleRank No. #16

MICROBE-LIFT ALGA32 Algaway 5.4 Algae Control Treatment for Ponds and Water Gardens, Safe for Koi Fish, Goldfish, Plants, and Decorations, 32 Ounces

KEEPS PONDS CLEAN & CLEAR: Algaway 5.4 is an E.P.A.-registered beneficial algaecide for outdoor ponds and other water features; It controls string algae, suspended algae blooms, and stops algae growth, creating a cleaner aquatic environment
CLEARER WATER: Algaway 5.4 Controls algae growth and eliminates green water in your self-contained ornamental pond; This allows you get more enjoyment from your fish and plants and see them clearly in any season
POND LIFE NOTES: Algaway 5.4 is 100% safe for all pond fish and plants which sets it apart from similar products; Not to be used with snails, shrimp and other crustaceans or mollusks
IMPORTANT NOTES: In ponds, ensure that water is well aerated via waterfall, fountain or other method to prevent fish loss; Aeration must be continuous; Highly concentrated formula shows results as little as 2 days; See usage chart for application guidance
PART OF MICROBE-LIFT'S POND CARE SYSTEM: Use Algaway 5.4 with other great products for your large or small backyard pond: PL Pond Bacteria and Outdoor Water Garden Cleaner, Sludge-Away Sludge and Muck Remover, Barley Straw Extract, and more

Rank No. #17

Fountain Algaecide and Clarifier - 16oz - Kills and Inhibits All Types of Algae Growth, Formulated for Small Ponds and Water Features, Treats up to 16,000 Gallons

Fountain Algae Control Solution 16-Ounce Bottle. Also available in 8 oz, 32 oz. and 64 oz. bottles. DO NOT USE WITH FISH.
Effectively eliminates green water algae, string and hair algae, blanketweed algae and others. Non-hazardous, non-staining, and non-foaming when used as directed.
Controls green water to keep pond water clean and clear in ornamental ponds and water gardens.
Use only as directed to keep water safe for pond plants, surrounding wildlife and pets. Not safe for fish.
Dose every three days until algae is controlled and then treat weekly. Maintain by using .75 oz. of product per 1,000 gallons of water every 5 days.

SaleRank No. #18

BioSafe Systems 3002-8 GreenClean Granular Algaecide String Algae Control for Koi Ponds, Fountains, Waterfalls, Water Features on Contact, 8 lbs, EPA Registered

GREENCLEAN GRANULAR ALGAECIDE: This 8-pound bucket treats and controls algae in up to 16,000 gallons of water for your in-home or residential ponds, fountains, or water features; this product can be used while your pond is stocked.
IDEAL FOR PONDS WITH FISH AND AQUATIC LIFE: This product is not harmful to fish or aquatic plants when used as directed and can be used while your pond or water feature is fully stocked; kill algae and improve water quality while your fish and plants thrive.
CLEAN FORMULA: Our clean formula is a great alternative to harsh chemicals and it is chlorine, copper, and phosphate-free; that means it won’t harm fish or plants and targets the algae in your pond.
WORKS FAST: This product is quick and efficient and begins working on contact, killing algae fast; you'll see full results in 24 to 48 hours after proper treatment, releasing oxygen to your water feature.
TREATS TWO ALGAES: GreenClean Granular Algaecide is effective and offers immediate results when eliminating blue-green and string algae; It kills on contact and works best when applied in the early morning hours on calm, sunny days.

Rank No. #19

EasyCare FounTec Algaecide and Clarifier

Algaecide clears pond and fountain water
Safe for plants, birds, and wildlife
NOT safe for fish
Use in water features, indoors or out
Keep water free of mosquitos

Rank No. #20

Green X 5lb- String Algae Remover for Koi Ponds, Fountains, Waterfalls, Water Features- Safe for Fish Contact Algae Control- Treats up to 80,000 Gallons- Concentrated Granular Algaecide

For control of algae in ponds, water gardens, water features, standing water, watering tanks, storage tanks and water collectors
Broadcast this product directly on to the water surface, from shore or dissolve and spray any algae matted at surface. Water features equipped with an aerator, or a waterfall that creates turbulence facilitates rapid and adequate mixing when treating entire water volume
Remove organic matter that rises to the surface. Unremoved organic matter can stimulate re-growth
For best results, apply in the morning hours when the water is warm; sunlight and higher water temperatures accelerate algaecides activity
Copper Free Formulation, Safe for all plants, fish, wildlife, domestic & wild animals

Last update on 2023-08-10 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

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FAQ:

Q: How do you treat algae in a pond?

A: Treat the pond water with algaecides. If you can’t clean your water and remove your algae any other way, you can use algaecides to treat the water and kill the algae. Purchase an algaecide or herbicide that contains copper and spray it over your pond to begin killing off the algae.

Q: How do you control algae in a pond?

A: You can also reduce direct sunlight into your pond by adding floating plants, such as lilies and lotus, whose leaves provide shade to control algae growth. Add submerged plants that release oxygen to the water. All aquatic plants absorb nutrients and starve the algae.

Q: Is there a secret to pond algae control?

A: Both of these things, when added to pond water will definitely help algae grow. So here’s the big “secret” to pond algae control. Identify the root cause (s) that are helping that algae grow well. When you do this, and then attack this root cause in some way, in many cases, algae will go away after a time.

Q: Can a pond aerator reduce algae?

A: According to Purdue University, aerators help remove phosphorous from your pond water, which reduces the occurrence of algae , but aeration alone will not prevent algae growth entirely, particularly if phosphorus continues to be introduced into the pond.