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API Algaefix Pond Algaecide (Pondcare)

Kills pond algae - green water and blanket weed

API (formerly Pondcare) Algaefix is an algaecide which effectively controls green water algae, string or hair algae and blanket weed in ponds that contain live plants. Controls existing algae and helps resolve additional algae blooms. Keeps ornamental ponds and water gardens clean & clear.

For help and information about common problems with Ponds and Water Quality see our Pond FAQ Help Section

  • Can be used in ponds containing live plants and fish.
  • Effectively controls "green water" algae blooms and blanket weed (Oedogonium)
  • Keeps ornamental ponds and water gardens clean and clear.
  • An EPA registered Algaecide that helps resolve future algae problems.
  • Do not use with crustaceans, including crabs, shrimp and freshwater lobsters.
  • Do not use in aquariums/ponds containing fish for human consumption.
  • DO NOT OVERDOSE, read instructions carefully. Overdosing this product can have harmful effects on your pond and fish
  • Ensure you have strong constant water flow when using this product as killing all of your algae at once will cause a drop in oxygen in your pond water and if there is insufficient water flow this could affect your fish negatively
  • Good to use in conjunction with a sludge remover to break down dead algae such as Blagdon Sludge Buster.

Using algae treatments can be very effective at clearing algae, however they generally do not treat the underlying causes of algae. Some of the main causes of algae in ponds are:

  • Undersized filtration system - your filter and pump are too small for your pond. Click here for information on sizing up the correct filter and pump for your pond.
  • Not enough flow -  you are not moving enough water around your pond or not running your pump all tht time. More flow = less algae/more oxygen and fish generally love it.
  • Too much flow through your filter/uv lamp - if water moves too quickly past your uv lamp it doesn't have time to kill the algae properly.
  • Too many fish for the size of the pond - too many fish in a small pond leaves a lot of organic waste
  • Not running your pump/filter 24/7 - for pond filters to work properly they MUST be running 24/7. There is no way around this.
  • No Ultra Violet Clarifier on your filtration setup - UV lamps can be extremely effective at keeping water from turning green.

Aussie's Observations about API Algaefix Pond Algaecide (Pondcare)

Budget • Good • Better • Best • Superior

Suitable for:

Use to treat all kinds of algae, green water and blanket weed in ponds.

What we liked:

Broad spectrum algaecide which works for different kinds of algae.

Less than ideal:

Algaefix is a chemical which kills algae and while it is very effective it can be harsher than other more natural algae treatments such as Blagdon Blanket Weed Algaway, Blagdon Pond Balance, Blagdon Green Away, Barley Straw Extract or Lysofoss so it is very important not to overdose.

From $22

Purpose and Benefits:
Algaefix is a liquid algae-control product for use in ornamental fishponds, water gardens, fountains, and freshwater aquariums. Algaefix is approved for use in ponds and aquariums containing live plants and fish. Algaefix controls many types of algae including "green water" blooms and filamentous algae. Algaefix is colourless and non-corrosive.

Directions for Use:
Use 5ml per 200 litres of aquarium/pond water. Repeat dose every three days until algae is controlled. Siphon or scrape any left over dead algae. Once algae growth is under control, add one dose every 5 days for the next month, the treatment can then be extended out to every 14 days in winter. 7 - 10 days in summer doses of Algaefix will control algae growth and reduce maintenance.

When algae dies it consumes great amounts of the pond’s supply of dissolved oxygen. Killing all the algae at once can be disastrous if proper precautions are not taken.

  • Aerate the pond heavily when using AlgaeFix™.
  • Never use the product at dusk or at night when oxygen levels are low.
  • Do not treat the pond and leave. Keep an eye on the fish during treatment and if the fish come to the surface as if gasping for air make an immediate water change to dilute the treatment!

Alternative Products

Different brands or similar products to consider

Blagdon (Interpet) Blanket Weed Algaway

No longer available - best option is Tornado Algaelift

Out of stock

Blagdon (Interpet) Pond Balance

None available, go to Algae Lift

Out of stock

Lysofoss Biological Water Treatment

Go to Tornado Biostim Liquid treatments

Out of stock

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