API Pond AlgaeFix – 1 Gallon
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Description
API Pond AlgaeFix – 1 Gallon (SKU 3169) is an EPA-registered fast-acting liquid algaecide that effectively controls three primary types of pond algae: green water algae (Chlorella sp.), string and hair algae (Cladophora sp.), and blanketweed (Oedogonium sp.). At a dosing rate of just 1 teaspoon per 50 gallons, the 1-gallon bottle treats up to 38,400 gallons, making it the most cost-effective AlgaeFix size for large ponds and pond maintenance programs.
AlgaeFix is safe for fish and aquatic plants when used as directed. It is labeled for use in ponds with live plants — a key advantage over copper-based algaecides that harm aquatic vegetation. Important: AlgaeFix requires vigorous, continuous aeration before and during treatment, is approved for synthetically lined ponds only with no outflow to natural waterways, and is lethal to freshwater crustaceans (shrimp, crabs, lobsters). Read all safety information before treating.
- Vigorous, continuous aeration required before and throughout treatment — treating without aeration can cause dangerous oxygen depletion and fish death
- Synthetically lined ponds and fountains ONLY — water must be contained with no outflow to streams, ditches, or natural waterways
- LETHAL to freshwater shrimp, crabs, lobsters, crayfish, and snails — do not use if pond contains these invertebrates
- Do not overdose — measure pond volume accurately; rapid algae death depletes dissolved oxygen
Key Features & Benefits
Technical Specifications
| Specification | Value |
|---|---|
| SKU (PPD) | 3169 |
| API Part Number | 169C |
| Size | 1 Gallon (128 oz / 3.78 L) |
| Active Ingredient | Poly[oxyethylene(dimethyliminio)ethylene(dimethyliminio)ethylene dichloride] — 4.50% |
| EPA Registration | #8709-8 |
| Coverage | Treats 38,400 US gallons (145,344 L) |
| Dosing Rate | 1 tsp (5 ml) per 50 gal | OR | 1/4 cup (60 ml) per 600 gal |
| Algae Controlled | Chlorella sp. (green water), Cladophora sp. (string algae), Oedogonium sp. (blanketweed) |
| Initial Treatment | Repeat every 3 days until algae controlled |
| Maintenance | Once per week |
| Pond Type | Synthetically lined ponds and fountains ONLY — contained water, no outflow |
| Pre-Application | Vigorous, continuous aeration required BEFORE and DURING treatment |
| NOT Safe For | Freshwater shrimp, crabs, lobsters, crayfish, snails, and other mollusks/crustaceans |
| Fish Safety | Safe for fish and plants when used as directed at labeled rates |
| Application Point | Near pump outflow, waterfall, or aeration device |
Dosing Quick Reference
| Pond Size | Dose (tsp) | Dose (ml) | Dose (cup) |
|---|---|---|---|
| 500 gallons | 10 tsp | 50 ml | ~3.4 tbsp |
| 1,000 gallons | 20 tsp | 100 ml | ~0.4 cup |
| 2,500 gallons | 50 tsp | 250 ml | ~1 cup |
| 5,000 gallons | 100 tsp | 500 ml | ~2 cups |
| 10,000 gallons | 200 tsp | 1,000 ml | ~4 cups (1 qt) |
Always measure pond volume accurately before dosing. Do not overdose. Rapid algae death from overdosing depletes dissolved oxygen — ensure aeration is running throughout treatment and after.
API AlgaeFix Size Options
| Size | Coverage | Best For |
|---|---|---|
| 8 oz | 2,400 gallons | Small ponds, fountains, first-time use |
| 16 oz | 4,800 gallons | Small-medium ponds, seasonal treatment |
| 32 oz | 9,600 gallons | Medium ponds |
| 64 oz | 19,200 gallons | Large ponds |
| 1 Gallon ← This | 38,400 gallons | Large ponds; best seasonal value; pro use |
Frequently Asked Questions
What types of algae does API Pond AlgaeFix control?
AlgaeFix controls three primary pond algae types:
- Green water algae (Chlorella sp.) — single-cell free-floating algae that turns pond water pea-green or murky. Common in warm, nutrient-rich water in summer.
- String or hair algae (Cladophora sp.) — filamentous algae that forms stringy mats on rocks, waterfalls, and pond walls. The most common complaint algae type in koi ponds.
- Blanketweed (Oedogonium sp.) — forms dense cotton-wool-like mats that can cover the entire pond surface. Often confused with Cladophora but responds to the same treatment.
AlgaeFix does not control all algae species — particularly some blue-green algae (cyanobacteria) which are more resistant to the active ingredient and may require different treatment.
Is API AlgaeFix safe for koi, goldfish, and aquatic plants?
Yes — AlgaeFix is safe for fish (including koi and goldfish) and aquatic plants when used at labeled rates with adequate aeration. Critical requirements for safe use:
- Aeration: Vigorous, continuous aeration must be running before and throughout treatment. In warm water (above 75°F), this is especially critical as warm water holds less dissolved oxygen.
- Dose accurately: Do not overdose. Measure pond volume before treating.
- NOT safe for: Freshwater shrimp (cherry, Amano, ghost shrimp), crayfish, crabs, lobsters, snails, and other freshwater mollusks/crustaceans. AlgaeFix is lethal to these invertebrates at treatment concentrations.
What is the dosage for the 1-Gallon AlgaeFix bottle?
The dosing rate is 1 teaspoon (5 ml) per 50 gallons of pond water, or equivalently, 1/4 cup (60 ml) per 600 gallons. Measure your pond volume accurately before applying — do not estimate and do not overdose.
The 1-gallon (128 oz) bottle treats 38,400 total gallons at this rate. For a 2,400-gallon pond, that’s 16 full treatments — roughly 4 months of every-3-day treatment or over 3 years of weekly maintenance.
For initial curative treatment: apply every 3 days until algae is controlled. For ongoing maintenance: apply once weekly.
Can I use AlgaeFix in a pond with a stream or that drains to a natural waterway?
No. API Pond AlgaeFix is labeled for use in synthetically lined ponds and fountains only, where all water is contained without any outflow. This includes no drainage to:
- Streams, creeks, or rivers
- Irrigation ditches or drainage channels
- Natural lakes, ponds, or wetlands
- Storm drains that flow to natural waterways
Using AlgaeFix in a pond that has outflow to natural waterways is a violation of the EPA label and federal law (FIFRA). The active ingredient is harmful to aquatic invertebrates in natural ecosystems at treatment concentrations.
Can I use AlgaeFix and EcoFix at the same time?
No — use AlgaeFix alone until algae is under control. AlgaeFix and EcoFix should not be applied to the pond simultaneously. The recommended sequence is:
- Apply AlgaeFix every 3 days until the algae is controlled (usually 1–3 treatments)
- Remove dead algae by siphoning or skimming from the pond surface
- Once algae is under control, begin or resume EcoFix bacterial treatment to address the organic load left behind by the dead algae
Why do I need to run aeration when using AlgaeFix?
AlgaeFix works by killing algae — which is exactly what you want. However, large amounts of dying algae decompose rapidly in the pond, and this decomposition consumes dissolved oxygen. Without adequate aeration, oxygen levels can drop below the minimum fish need to survive, especially in warm water where oxygen levels are already lower. Two specific risks:
- Direct oxygen depletion from rapid algae decomposition after treatment
- Secondary oxygen depletion from bacteria consuming the dead algae matter over the following days
Always run a waterfall, fountain, air stones, or other aeration continuously during and after treatment. In warm weather (above 75°F) or heavily stocked ponds, maximize aeration before applying.
Why Buy from Pond Pro Direct?
- Authentic API products — genuine EPA-registered formula
- Expert pond algae control guidance — call or text (765) 508-4352, Mon–Fri 9am–5pm EST
- Free shipping on all orders
- Price match guarantee on identical products
- 30-day return period on eligible items
Legal notice: API Pond AlgaeFix is an EPA-registered pesticide (Reg. #8709-8). It is a violation of Federal law to use this product in a manner inconsistent with its labeling. For pond and fountain use only where water is contained without outflow. Do not use with freshwater crustaceans.
Price Match
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For more information, please check out Price Match Policy Page
Shipping & Delivery
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- Typical handling time: 1–5 business days
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- Estimated delivery window: 6–13 business days
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Returns & Refunds
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Once an order has shipped or entered fulfillment, it may no longer be eligible for cancellation. If you no longer wish to keep the item, you must wait until delivery and then request a return.
A Return Merchandise Authorization (RMA) is required before returning any item.
Custom or Made-to-Order Items
Custom or made-to-order products are produced specifically for your order and cannot be canceled or refunded once production has begun, except in cases of defect or error.
Product pages will clearly indicate when an item is custom or made-to-order. If you are unsure whether an item falls into this category, please contact us before placing your order.
Returns & Refunds
Returns are subject to the following conditions:
- Customers have 30 days from delivery to request a return, unless otherwise stated on the product page or by manufacturer policy
- Items must be unused, uninstalled, and in original packaging
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Because we ship products directly from manufacturers, return eligibility may vary by brand. If a manufacturer does not permit returns on a specific product, we may be unable to accept the return. Please contact us if you would like confirmation of return eligibility for a specific item.
Fees & Shipping Costs
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If you are exchanging an item rather than returning it outright, we may be able to assist with some costs depending on the product and manufacturer.
For full details, including freight deliveries, damage reporting requirements, and manufacturer-specific terms, please review our complete Return and Refund Policy
