API Pond AlgaeFix – 1 Gallon

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.