Algi Cure Algaecide: Everything You Need to Know

Algae growth can be a major nuisance in ponds, lakes, swimming pools, and other water bodies. If left unchecked, algae can take over and cause various problems – from being unsightly to affecting water quality. Algi Cure Algaecide is one of the most popular algaecide treatments to prevent and eliminate algae in freshwater bodies.

This comprehensive guide will provide everything you need to know about Algi Cure Algaecide, from what it is and how it works to proper dosage and application methods. We’ll also examine its ingredients, effectiveness on different algae types, and safety considerations. By the end, you’ll be equipped with the knowledge to determine if Algi Cure is the right Algaecide for your needs.

What is Algi Cure Algaecide?

Algi Cure Algaecide is a powerful broad-spectrum algaecide produced by Applied Biochemists, a leading manufacturer of specialty aquatic products. It contains the active ingredients poly[oxyethylene(dimethyliminio)ethylene(dimethyliminio)ethylene dichloride] and tributyl tetradecyl phosphonium chloride (TTPC).

It is designed to be fast-acting and effective at controlling all types of algae in lakes, ponds, fountains, fish hatcheries and other contained bodies of water. The biocide disrupts algae cell metabolism and destroys the cell walls, leading to rapid algae death. It is available in both liquid and granular formulations.

Here are some key features of Algi Cure Algaecide:

  • Broad-spectrum control of all algae varieties including Chara, Spirogyra, Pithophora, Cladophora and planktonic algae.
  • Fast-acting formula starts to work immediately on contact with algae.
  • Liquid form is easy to apply and disperses quickly.
  • Granular form sinks rapidly and is optimal for treating bottom algae.
  • Can be used as both a curative and preventative treatment.

How Does Algi Cure Algaecide Work?

Algi Cure contains two powerful active ingredients that synergize to disrupt algae cells and induce cell death.

The first ingredient, poly[oxyethylene(dimethyliminio)ethylene(dimethyliminio)ethylene dichloride], is a quaternary ammonium compound. When applied to algae, it breaks down the cell membranes and walls, causing the contents to leak. This quickly leads to osmotic shock and the death of the algae.

The second active ingredient, tributyl tetradecyl phosphonium chloride (TTPC), is an algaecide that inhibits photosynthesis. It blocks the transfer of electrons in Photosystem II, which effectively starves the algae cells by preventing them from processing sunlight into energy. The combined action of both ingredients leads to the rapid extermination of algae.

Within hours of application, the algae turn white and disintegrate. The dead algae cells will clump together for easy removal via skimming or filtration. For severe algae blooms, repeat applications are recommended to eliminate the growth fully.

When and How to Apply Algi Cure Algaecide

Proper application of Algi Cure is key to maximizing its effectiveness. Here are some tips on when and how to use Algi Cure:

  • As a Curative Treatment: Use Algi Cure to eliminate existing algae growth. Apply when growth first appears to prevent major blooms.
  • Preventative Maintenance: Apply weekly or biweekly to inhibit algae growth and clear water.
  • Application Method: Spray evenly over the affected area. If treating the entire pond, apply around the perimeter. For spot treatments, spray problem areas.
  • Dosage: Follow label instructions and use test strips to determine proper dose. Generally 0.3-1.5 gallons per acre-foot of water.
  • Timing: Apply in the early morning or late evening when fewer people swim. Avoid windy days that can blow the spray.
  • After Application: Let the product sit overnight before swimming. Remove dead algae via skimming and filtration. Avoid using other chemicals for a few days. Test water balance and only reapply if algae returns.

With the right timing and dosage, Algi Cure can knock out algae fast. Always adhere to the label directions based on your specific needs. Consult a lake management professional for guidance on larger treatments.

Active Ingredients in Algi Cure Algaecide

Algi Cure contains two potent active ingredients that target algae cells:

Polyethylene dichloride

This quaternary ammonium compound, also known as polyquaternium-7, breaks down the cell membrane and walls of algae. It causes the cytoplasm to leak, leading to cell lysis and death. It is a fast-acting ingredient, causing visible damage to algae within hours.

Tributyl Tetradecyl Phosphonium Chloride (TTPC)

TTPC is an organic phosphonium salt that inhibits photosynthesis in algae. It blocks electron transport in Photosystem II. This starves the algae of energy and stops it from increasing. TTPC is known to be very effective against planktonic algae.

Combining these two ingredients gives Algi Cure its rapid and broad-spectrum control over all types of algae. The polyquaternium-7 quickly damages the cells, while the TTPC shuts down algae growth by inhibiting photosynthesis.

Is Algi Cure Safe for Fish and Aquatic Life?

Many pond owners are understandably concerned about the safety of algaecides for their fish and aquatic plants. When used as directed, Algi Cure will not harm most aquatic lifeforms. Here is some information on its safety:

Safe for use in lakes, ponds, and water gardens when label directions are followed.

  • Low toxicity to fish, aquatic invertebrates, and wildlife. Not harmful to vegetation.
  • The active ingredients have a low persistence and break down quickly in water.
  • Has been evaluated by EPA for toxicity and environmental impact. Considered safe when used as per the label.
  • If overapplied, it may be moderately toxic to sensitive species like trout, crustaceans, and mollusks.

To be safe, test on a small area first. Remove fish from treatment ponds/enclosures until the product has fully dispersed. Avoid overapplying in sensitive environments like wetlands and habitats with endangered species. Overall, Algi Cure is considered one of the safer algaecide options when used responsibly.

Effectiveness of Algi Cure on Different Algae Types

Algi Cure is effective against a broad spectrum of algae species. The fast-acting polyquaternium-7 attacks all algae cell walls while the TTPC inhibits photosynthesis common to all algae.

Here is a look at its efficacy against some common algae varieties:

  • Green algae like Spirogyra, Chlorella, and Cladophora: Highly effective due to the TTPC component. Green algae rely heavily on photosynthesis.
  • Blue-green algae (cyanobacteria) like Anabaena, Aphanizomenon, Microcystis: Very effective since it attacks the cells and disrupts metabolism.
  • Mustard algae (diatoms) like Synedra and Cyclotella: Moderately to highly effective depending on type and growth stage. More resistant forms may require multiple applications.
  • Chara (muskgrass/stonewort): Effective against this stubborn macroalgae. The liquid form works best on Chara.
  • Filamentous algae like Pithophora, Cladophora and Spirogyra: Highly effective against these common pond algae nuisances.

For best results, treat in early growth stages before algae becomes established. The liquid form generally provides faster control on problematic algae like Chara. Repeat applications may be needed for mature, stubborn growths.

How Quickly Does Algi Cure Work Against Algae?

Algi Cure starts working immediately on contact with algae cells. In most cases, you can expect visible results within 24-48 hours in the form of whitening, clumping, and disintegrating the algae.

The speed of control depends on a few factors:

  • Growth stage – Newly formed algae is more quickly controlled than mature, established algae.
  • Type of algae – Some varieties are more susceptible than others. Green algae and cyanobacteria die rapidly while thick Chara mats take longer.
  • Severity of bloom – Heavier growth requires more time for the product to penetrate and kill off all algae fully.
  • Temperature – Higher water temperatures accelerate the activity of Algi Cure.
  • Water parameters – Imbalanced water can reduce efficacy. Optimal pH, oxygen levels, and low phosphates support better performance.

Under ideal conditions, light algae growth turns white within 12-24 hours. Heavy blooms may take 3-5 days for the full effect. Monitor areas closely after application to ensure the algae has been completely eradicated.

Dosage and Application Rates

Applying the optimal dose of Algi Cure is crucial for effectively combatting algae while minimizing risks. Here are some general dosage guidelines:

  • Initial Dose: 0.3 to 1 gallon per acre-foot of water as per label instructions
  • Maintenance Dose: 0.1 to 0.3 gallons per acre-foot of water weekly/biweekly
  • Spot Treatment: 0.3 oz (5mL) per 100 sq ft area
  • How to Calculate Dosage: Take surface area x average depth x 7.5 to get volume in acre-feet. Multiply by dosage rate.

Always do a small test area first, especially in sensitive environments. Retreat if algae regrows, but avoid overapplying. Consider hiring a professional to determine the right rates for larger bodies of water.

How to Apply Liquid and Granular Forms

Algi Cure comes in easy-to-use liquid formulations as well as granular forms. Here is how to apply each:

Liquid Algaecide

The liquid product should be sprayed evenly over the algae-affected area. Use a pump sprayer for small areas or a boat for larger bodies.

  • Shake the container well before pouring into the sprayer.
  • Try to coat all visible algae growth, spraying it directly.
  • Avoid applying during high winds which can blow the spray off course.
  • Rinse spray equipment thoroughly after application.

Granular Algaecide

The granular form sinks quickly, which is ideal for treating bottom algae like Chara:

  • Simply scatter by hand or using a mechanical spreader over the infested area.
  • For full coverage, you may need to apply half the dose in one direction and the rest in a perpendicular direction.
  • The granules dissolve slowly, releasing the active ingredients.
  • Rake up any undissolved granules after an application is complete.

How Long Does Algi Cure Take to Work on Severe Algae?

For severe algae blooms that form dense mats, Algi Cure may take 2 to 5 days to penetrate and kill off all growth fully.

The active ingredients work quickly to damage cells and inhibit photosynthesis. However, large clumps of algae can shield inner layers from full exposure.

To optimize results:

  • Apply Algi Cure at the first signs of an algae bloom to prevent dense growths from forming.
  • Use maximum dosage rates as per the product label.
  • Consider treating in sections for very extensive growth rather than all at once.
  • Agitate the water after application to disperse the Algaecide and expose all algae.
  • Be patient – removal of all the dead algae can take 1-2 weeks. Healthy water conditions accelerate progress.

With heavy infestations, a second dose of Algi Cure may be warranted after 5-7 days to kill off any remaining algae. Consistent monitoring and maintenance is key.

How Long Does Algi Cure Last in the Water?

Algi Cure’s active ingredients are fast-acting and break down quickly, rather than accumulating for long periods. Here’s how long the effects last:

  • The algicidal effects start immediately on contact and peak around 24-48 hours after application.
  • The product fully dissipates from most pond waters within 5-7 days.
  • It has low persistence, allowing for safe re-entry for swimming, fishing, and irrigation once dispersed.
  • To maintain algae control, reapply Algi Cure weekly or biweekly as needed. More frequent doses may be needed in times of rapid growth.

The short period of effectiveness is a benefit, as it reduces risks to aquatic lifeforms after application. Monitor water quality and retreat areas proactively as needed when growth reappears.

What’s Better – Algi Cure vs Copper Sulfate for Algae?

Copper sulfate and Algi Cure are two common algaecides. Copper sulfate has traditionally been used but here is how the two compare:

Algi Cure Pros:

  • Broad spectrum control of all algae
  • Rapid, visible results within 24-48 hours
  • Lower toxicity to fish and aquatic plants
  • Breaks down quickly after use
  • Can be used in ponds, lakes, pools, and fountains
  • Liquid form stays suspended for thorough algae contact

Copper Sulfate Pros:

  • Very effective on difficult algae like Chara
  • Has antibacterial properties
  • Leaves a residue to prevent regrowth
  • Low cost and widely available
  • Approval for use in fish production and drinking water

The choice depends on your specific needs. Algi Cure provides rapid, thorough algae killing but may need reapplied often. Copper sulfate offers lasting control but has higher environmental risks. Combining both may provide the best results.

How Does Algi Cure Compare to Other Algaecides?

Algi Cure is one of the leading algaecide brands on the market. Here’s how it stacks up against a few other common options:

Algi Cure vs. Cutrine-Plus: Both contain chelated copper for strong algicidal effects. Algi Cure works more quickly, while Cutrine-Plus provides longer-lasting control.

Algi Cure vs. Captain: Captain also has copper compounds plus glyphosate for broad-spectrum action. However, Algi Cure is faster-acting and less toxic to aquatic life.

Algi Cure vs. GreenClean: GreenClean takes an enzyme-based approach to killing algae over several days. It is safe for fish but slower and less potent than Algi Cure.

Algi Cure vs. Hydrothol: Hydrothol’s key ingredient is endothall, inhibiting plant and algae growth. Algi Cure has a wider range of targeted activity.

While outcomes depend on the specific conditions, Algi Cure provides the most rapid and complete algae control across the board. It offers advanced, broad-spectrum, fast-acting performance.

Non-Chemical Alternatives for Controlling Algae

For those looking to avoid chemicals, there are a few alternative options to reduce algae growth:

  • Pond dyes – Darkens the water, which reduces sunlight penetration and photosynthesis. Has limited effectiveness.
  • Barley straw – Releases compounds as it decomposes that may hinder algal growth. Effectiveness is mixed.
  • Nano-bubble generators – Tiny oxygen bubbles help prevent algae-promoting low oxygen conditions. It also adds surface agitation.
  • Aquatic plants – Compete with algae for nutrients and provide shade. Healthy plant coverage discourages algal takeovers.
  • UV/ultrasound devices – Some claim UV light or ultrasound waves help control algae but evidence is lacking.
  • Water aeration – Proper aeration and circulation prevents stagnant zones where algae thrive.
  • Reduce runoff/nutrients – Limiting nutrient inflow from landscaping and runoff inhibits algae growth at the source.

While these methods help reduce algae problems, they may not be as reliable for resolving heavy infestations. Algi Cure or another quality algaecide is often needed, especially as a corrective treatment. Using a multi-pronged approach can help provide the best long-term control.

Frequently Asked Questions

How long does algi cure take to work on yellow algae?

Algi Cure is highly effective at controlling yellow algae, also known as mustard algae. Most yellow algae will turn white and die within 12-24 hours of treatment. Mature blooms may take 2-3 days for full results.

Will Algaecide harm my pond plants?

Algi Cure will not harm pond plants and vegetation when used as directed. It specifically targets algae. Avoid direct application to delicate plants. Test small amounts first on sensitive aquatic plants.

Is it safe for pets to swim after using Algaecide?

Wait at least 24 hours before allowing pets to swim in treated water. When

Is it safe for pets to swim after using Algaecide?

Wait at least 24 hours before allowing pets to swim in treated water. When used as directed, Algi Cure breaks down quickly after application and is not harmful once dispersed in the water body.

How do I get rid of dead algae after algaecide treatment?

Dead algae will clump together at the surface after treatment. Remove clumps by skimming the pond surface daily and run your filtration system as normal to capture loose debris. Clean filters regularly until the dead algae is depleted.

Can Algi Cure be used in ponds with fish, plants, or frogs?

Algi Cure can be safely used in ponds containing fish, frogs, and aquatic plants when applied at the recommended dosage. Remove sensitive organisms like frogs during treatment, then return once the Algaecide has dispersed.

Will Algaecide negatively impact my pond’s ecosystem?

When used responsibly, algaecides like Algi Cure do not cause long-term damage to the pond ecosystem. They work quickly and break down within days. Spot treat only affected areas to limit any collateral impacts. Maintain balanced water conditions before and after treatment.

How often can I apply Algi Cure algaecide?

Algi Cure can be reapplied every 5-7 days to control algae regrowth. More frequent treatments may be needed when growth is rapid. Avoid overapplying. Test water periodically and only retreat when algae reappears.

Is Algi Cure safe for drinking water reservoirs?

Algi Cure is registered for use in potable water reservoirs. Check local guidelines and notify water supply authorities before applying. Pre-treatment testing and post-treatment monitoring of water may be required. Strictly follow all label directions.


Algi Cure is one of the most trusted and proven algaecide products for rapidly and effectively controlling green water, string algae, and slime growth in ponds, lakes, and other contained water bodies. It combines powerful active ingredients that damage algal cells on contact while shutting down their ability to photosynthesize and grow.

This comprehensive guide covers everything pond owners need to know about choosing, dosing, and applying Algi Cure for optimal safety and algae control. While not a standalone solution, it’s an invaluable tool for quickly eliminating algae blooms and restoring healthy water conditions as part of an integrated algae management plan. Always apply algaecides cautiously and responsibly with aquatic life in mind.