Broad Algae Control
Formulated for existing string algae, blanketweed and the single-celled algae that cause green water.
CrystalClear® Algae D-Solv®
$14.99
Replaces Blue Thumb Fountain Clear.
Copper-free liquid algaecide for self-contained water features
CrystalClear® Algae D-Solv®
Control existing string algae, blanketweed and green water in self-contained ornamental ponds, fountains and aquariums. The concentrated liquid is easy to size by water volume and is offered in four bottle sizes for occasional or ongoing treatment.
1 fl ozTreats 360 gallons
5.4%Active ingredient
4 sizes16 fl oz to 2.5 gallons
EPA registeredNo. 14802-8-83742
Replacing Blue Thumb Fountain Clear? Algae D-Solv is the current replacement listed by Blue Thumb. Always follow the Algae D-Solv label and dosage rather than directions from an older product.
Read the Label Before You Treat
- Use only in self-contained aquariums, ornamental ponds and fountains with no outflow after treatment.
- In ponds, maintain continuous vigorous aeration. During warm weather and high water temperatures, vigorous 24-hour aeration is required.
- Not safe for snails, shrimp, clams, other crustaceans or mollusks.
- Keep out of reach of children. Avoid contact with skin, eyes and clothing, and wash thoroughly after handling.
- Do not exceed the label dose. Federal law requires this pesticide to be used consistently with its labeling.
Target the Algae You Can See
Copper-Free Formula
Contains no copper and will not harm fish or live ornamental plants when used exactly as directed.
Simple Volume-Based Dose
Measure 1 fluid ounce for every 360 gallons, then apply evenly around the edge or where circulation is strongest.
Choose the Right Bottle Size
Each size uses the same application rate. Choose based on your water volume and how many treatments you expect to make. The total gallons shown are the cumulative volume one full bottle can treat at the labeled dose.
| Package size | Blue Thumb SKU | Total gallons treated |
|---|---|---|
| 16 fl oz | PB2002 | 5,760 gallons |
| 32 fl oz | PB2019 | 11,520 gallons |
| 1 gallon | PB2033 | 46,080 gallons |
| 2.5 gallons | PB2668 | 115,200 gallons |
16 fl oz
Blue Thumb SKU:PB2002
Total coverage:5,760 gallons
32 fl oz
Blue Thumb SKU:PB2019
Total coverage:11,520 gallons
1 gallon
Blue Thumb SKU:PB2033
Total coverage:46,080 gallons
2.5 gallons
Blue Thumb SKU:PB2668
Total coverage:115,200 gallons
Shipping restriction: Algae D-Solv cannot be shipped to Alaska, Connecticut, Hawaii, Puerto Rico or Canada.
How to Apply Algae D-Solv
Use these planning steps as a quick overview, then follow the complete directions and precautions on the label for your selected bottle.
Rectangular water volume: length × width × average depth (feet) × 7.5 = gallons
Calculate the Water Volume
Measure the water feature, calculate its gallons and base the dose on actual water volume—not surface area.
Remove Excess Algae
For heavy growth, manually remove as much algae as practical before treatment to reduce the amount of decaying organic matter.
Start Continuous Aeration
Make sure the pond has vigorous aeration from a waterfall, fountain or aeration device before applying. Keep aeration running continuously.
Measure the Dose
Apply 1 fluid ounce per 360 gallons. Do not use more than the recommended amount for your water volume.
Distribute Evenly
Pour the measured treatment evenly around the pond edges or into the area with the strongest circulation.
Monitor and Maintain
Watch fish and aeration as algae breaks down. Wait at least 3 days between treatments; for maintenance, repeat the labeled dose once per week.
Core Product Details
Product form:Liquid algaecide
Application rate:1 fl oz per 360 gallons
Active ingredient:Poly(oxyethylene) (dimethyliminio) ethylene (dimethyliminio) ethylene dichloride, 5.40%
EPA registration:14802-8-83742
Shelf life:2 years
Intended systems:Self-contained aquariums, ornamental ponds and fountains without outflow
After Treatment
- Keep aeration running continuously while treated algae decays.
- Remove settled or captured dead algae and check the pump pre-filter and filtration system as needed.
- Keep the container closed, out of reach of children and away from food when not in use.
- Do not reuse or refill the container; follow the label and local requirements for disposal or recycling.
For other pond-maintenance needs, browse Blue Thumb’s pond water treatments or fountain water treatments.
Product Labels & Safety Resources
Open the label for the exact bottle size you purchase and keep it available while measuring and applying the product.
Need Help Calculating a Dose?
Blue Thumb’s Sales and Technical Team can help you confirm water volume, bottle size and whether this treatment is appropriate for your pond or fountain.
Frequently Asked Questions
How much Algae D-Solv should I use?
Use 1 fluid ounce for every 360 gallons of pond or fountain water. Calculate the actual water volume and do not exceed the labeled dose.
Which types of algae does it treat?
Algae D-Solv targets existing string algae, blanketweed and the single-celled algae that cause green water.
Can I use it in a pond with koi, goldfish or plants?
It will not harm fish or live ornamental plants when used exactly as directed. Ponds must have continuous vigorous aeration; warm weather and high water temperatures require vigorous 24-hour aeration.
Is it safe for snails, shrimp or clams?
No. The product label states that Algae D-Solv is not safe for snails, shrimp, clams, other crustaceans or mollusks.
Can I use it in a pond or fountain with an outflow?
No. The label limits use to self-contained aquariums, ornamental ponds and fountains that will have no outflow after treatment.
How often can I apply it?
Use it for existing algae growth, wait at least 3 days between treatments, and repeat the labeled dose once per week for maintenance. Always follow the directions on your bottle.
Should I remove algae before treatment?
Yes, when growth is heavy. Removing excess algae first reduces the amount of decaying organic matter and the associated drop in oxygen as algae breaks down.
Does Algae D-Solv replace Blue Thumb Fountain Clear?
Yes. Blue Thumb lists CrystalClear Algae D-Solv as the replacement for Blue Thumb Fountain Clear. Use the current Algae D-Solv label and dosage instructions.
Where can this product be shipped?
It cannot be shipped to Alaska, Connecticut, Hawaii, Puerto Rico or Canada.
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