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

The 10 Best Aquarium Algaecides & Water Clarifiers

Jump to the list

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
97
$48.85Chewy Price
($48.85/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
290
$7.58Chewy Price
($0.95/fl oz)
Promo, Save 20% with code CYBER20

Our ratings

Ease of Use

4.5/5
Great

Effectiveness

4.5/5
Great

Ingredients

4.4/5
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
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
285
$7.32Chewy Price
($7.32/ea)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.1/5
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
4
Acurel F Aquarium Water Clarifier, 50-mL bottle

Acurel F Aquarium Water Clarifier, 50-mL bottle

Rated 4.6 out of 5 stars
136
$8.99Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.3/5
Great

Effectiveness

4.5/5
Great

Ingredients

4.3/5
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
5
Tetra Pond AlgaeControl Water Treatment, 101.4-fl oz bottle
Tetra Pond AlgaeControl Water Treatment, 101.4-fl oz bottle
Tetra Pond AlgaeControl Water Treatment, 101.4-fl oz bottle
Tetra Pond AlgaeControl Water Treatment, 101.4-fl oz bottle
Tetra Pond AlgaeControl Water Treatment, 101.4-fl oz bottle

Tetra Pond AlgaeControl Water Treatment, 101.4-fl oz bottle

Rated 4.4 out of 5 stars
76
$39.50Chewy Price
($0.39/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
API Pond-Zyme Sludge Destroyer Pond Sludge Remover, 16-oz bottle
API Pond-Zyme Sludge Destroyer Pond Sludge Remover, 16-oz bottle
API Pond-Zyme Sludge Destroyer Pond Sludge Remover, 16-oz bottle
API Pond-Zyme Sludge Destroyer Pond Sludge Remover, 16-oz bottle
API Pond-Zyme Sludge Destroyer Pond Sludge Remover, 16-oz bottle
API Pond-Zyme Sludge Destroyer Pond Sludge Remover, 16-oz bottle
API Pond-Zyme Sludge Destroyer Pond Sludge Remover, 16-oz bottle

API Pond-Zyme Sludge Destroyer Pond Sludge Remover, 16-oz bottle

Rated 4.5 out of 5 stars
112
$23.05Chewy Price
($1.45/oz)
Promo, Save 20% with code CYBER20

Our ratings

Ease of Use

4.1/5
Great

Effectiveness

4.1/5
Great

Ingredients

4.1/5
Great

Longevity

3.9/5
Good

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

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
8
Tetra Algae Control Pond Block Water Treatment, 4 count
Tetra Algae Control Pond Block Water Treatment, 4 count
Tetra Algae Control Pond Block Water Treatment, 4 count
Tetra Algae Control Pond Block Water Treatment, 4 count
Tetra Algae Control Pond Block Water Treatment, 4 count

Tetra Algae Control Pond Block Water Treatment, 4 count

Rated 4.5 out of 5 stars
86
$7.99Chewy Price
($2.00/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
9
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 4.6 out of 5 stars
19
$62.95Chewy Price
($62.95/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

4.4/5
Great

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

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
10
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
88
$13.99Chewy Price
($0.44/oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.2/5
Great

Effectiveness

4.2/5
Great

Ingredients

4.3/5
Great

Longevity

4.1/5
Great

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

Aquarium Type

Pond

Fish Type

Koi & Pond Fish