10 Best Aquarium Algaecides & Water Clarifiers 2025: According to Reviews | Chewy

The 10 Best Aquarium Algaecides & Water Clarifiers

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How we created this aquarium algaecides & water clarifier list

We leveraged input from our veterinarians and artificial intelligence to identify key considerations to help you find the best aquarium algaecides & water clarifier.
We scanned thousands of customer reviews and ratings and scored each product based on its performance against each of the key considerations. We then considered how popular a product is with Chewy customers and combined that with its key consideration scores to create the list of the best aquarium algaecides & water clarifiers.

Key aquarium algaecides & water clarifier considerations

Ease of Use

Effectiveness

Ingredients

Longevity

1
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal

Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal

Rated 4.7 out of 5 stars
96
$49.91Chewy Price
($49.91/gl)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.4/5
Great

Effectiveness

4.7/5
Excellent

Ingredients

4.7/5
Excellent

Longevity

4.5/5
Great

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
2
API Accu-Clear Freshwater Aquarium Clarifier, 8-fl oz bottle
API Accu-Clear Freshwater Aquarium Clarifier, 8-fl oz bottle
API Accu-Clear Freshwater Aquarium Clarifier, 8-fl oz bottle
API Accu-Clear Freshwater Aquarium Clarifier, 8-fl oz bottle
API Accu-Clear Freshwater Aquarium Clarifier, 8-fl oz bottle
API Accu-Clear Freshwater Aquarium Clarifier, 8-fl oz bottle
API Accu-Clear Freshwater Aquarium Clarifier, 8-fl oz bottle

API Accu-Clear Freshwater Aquarium Clarifier, 8-fl oz bottle

Rated 4.5 out of 5 stars
283
$9.48Chewy Price
($1.19/fl oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.5/5
Great

Effectiveness

4.6/5
Excellent

Ingredients

4.5/5
Great

Longevity

4.4/5
Great

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish...
3
Acurel F Aquarium Water Clarifier, 50-mL bottle

Acurel F Aquarium Water Clarifier, 50-mL bottle

Rated 4.6 out of 5 stars
129
$8.99Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.4/5
Great

Effectiveness

4.5/5
Great

Ingredients

4.4/5
Great

Longevity

4.5/5
Great

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish
4
Summit Clear-Water Barley Straw Pond Treatment, 1 count
Summit Clear-Water Barley Straw Pond Treatment, 1 count
Summit Clear-Water Barley Straw Pond Treatment, 1 count
Summit Clear-Water Barley Straw Pond Treatment, 1 count
Summit Clear-Water Barley Straw Pond Treatment, 1 count
Summit Clear-Water Barley Straw Pond Treatment, 1 count
Summit Clear-Water Barley Straw Pond Treatment, 1 count
Summit Clear-Water Barley Straw Pond Treatment, 1 count

Summit Clear-Water Barley Straw Pond Treatment, 1 count

Rated 4.3 out of 5 stars
279
$8.59Chewy Price
($8.59/ea)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.0/5
Great

Effectiveness

3.9/5
Good

Ingredients

4.2/5
Great

Longevity

4.0/5
Great

Is this aquarium algaecides & water clarifier right for my pet?

Top Ingredient

Barley Straw

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
5
Tetra Pond AlgaeControl Water Treatment, 33.8-fl oz bottle
Tetra Pond AlgaeControl Water Treatment, 33.8-fl oz bottle
Tetra Pond AlgaeControl Water Treatment, 33.8-fl oz bottle
Tetra Pond AlgaeControl Water Treatment, 33.8-fl oz bottle

Tetra Pond AlgaeControl Water Treatment, 33.8-fl oz bottle

Rated 4.4 out of 5 stars
76
$18.17Chewy Price
($0.54/fl oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.6/5
Excellent

Effectiveness

4.4/5
Great

Ingredients

4.4/5
Great

Longevity

4.3/5
Great

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
6
Boyd Chemi-Clean Red Cyanobacteria Aquarium Treatment, 2-g

Boyd Chemi-Clean Red Cyanobacteria Aquarium Treatment, 2-g

Rated 4.8 out of 5 stars
20
$17.99Chewy Price
($9.00/g)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.7/5
Excellent

Effectiveness

4.7/5
Excellent

Ingredients

4.7/5
Excellent

Longevity

4.7/5
Excellent

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater
7
Summit Clear-Water Barley Straw Extract Pond Treatment, 32-oz bottle

Summit Clear-Water Barley Straw Extract Pond Treatment, 32-oz bottle

Rated 4.2 out of 5 stars
83
$14.99Chewy Price
($0.47/oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.3/5
Great

Effectiveness

4.2/5
Great

Ingredients

4.3/5
Great

Longevity

4.2/5
Great

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
8
Microbe-Lift Sludge Away Pond Water Care, 1-gal jug
Microbe-Lift Sludge Away Pond Water Care, 1-gal jug
Microbe-Lift Sludge Away Pond Water Care, 1-gal jug
Microbe-Lift Sludge Away Pond Water Care, 1-gal jug
Microbe-Lift Sludge Away Pond Water Care, 1-gal jug
Microbe-Lift Sludge Away Pond Water Care, 1-gal jug

Microbe-Lift Sludge Away Pond Water Care, 1-gal jug

Rated 4.8 out of 5 stars
18
$54.95Chewy Price
($54.95/gl)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.7/5
Excellent

Effectiveness

4.8/5
Excellent

Ingredients

4.7/5
Excellent

Longevity

4.6/5
Excellent

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
9
Tetra Algae Control Pond Block Water Treatment, 50 count
Tetra Algae Control Pond Block Water Treatment, 50 count
Tetra Algae Control Pond Block Water Treatment, 50 count
Tetra Algae Control Pond Block Water Treatment, 50 count
Tetra Algae Control Pond Block Water Treatment, 50 count
Tetra Algae Control Pond Block Water Treatment, 50 count
Tetra Algae Control Pond Block Water Treatment, 50 count

Tetra Algae Control Pond Block Water Treatment, 50 count

Rated 4.5 out of 5 stars
86
$63.64Chewy Price
($1.28/ea)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.5/5
Great

Effectiveness

4.6/5
Excellent

Ingredients

4.2/5
Great

Longevity

4.5/5
Great

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
10
API Pond Ecofix Sludge Destroyer Pond Water Clarifier & Sludge Remover, 16-fl oz bottle
API Pond Ecofix Sludge Destroyer Pond Water Clarifier & Sludge Remover, 16-fl oz bottle
API Pond Ecofix Sludge Destroyer Pond Water Clarifier & Sludge Remover, 16-fl oz bottle
API Pond Ecofix Sludge Destroyer Pond Water Clarifier & Sludge Remover, 16-fl oz bottle
API Pond Ecofix Sludge Destroyer Pond Water Clarifier & Sludge Remover, 16-fl oz bottle

API Pond Ecofix Sludge Destroyer Pond Water Clarifier & Sludge Remover, 16-fl oz bottle

Rated 4.6 out of 5 stars
51
$18.61Chewy Price
($1.17/fl oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.7/5
Excellent

Effectiveness

4.7/5
Excellent

Ingredients

4.7/5
Excellent

Longevity

4.7/5
Excellent

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Pond

Fish Type

Koi & Pond Fish