Nualgi Ponds – Natural Algae Control + Water Clarifier

Rated 4.63 out of 5 based on 259 customer ratings
(273 customer reviews)


Use Nualgi Ponds™ to naturally balance your pond, control algae growth, and get crystal clear water you and your fish will enjoy more!

SKU: nualgiponds Category:
WHOLESALE DISCOUNT – buy a total of 12 bottles or more and receive Special Wholesale Pricing. To apply to the program and view pricing info, go sign-up for our Wholesale Pricing Program.


How Does Nualgi Ponds Work?

Within 3 – 5 hours of applying Nualgi Ponds, a bloom of Diatom algae (the good kind!) will develop. The diatom algae bloom out-compete nuisance algae for CO2, N, P and other nutrients, causing the bad algae to die off. It then locks away some of the harmful nutrients in the new bio mass that is consumed as live food for your fish and zooplankton. The growth of diatoms provides oxygen to bacteria who in turn clean up the waste products of fish and leftovers. The exponential growth of diatoms provides oxygen to bacteria who in turn clean up the waste products of fish and leftovers. This natural process helps clean ponds and make their water sparkling while helping reduce bad odors.

What Are the Benefits of Using Nualgi Ponds?

  • NATURAL ALGAE CONTROL FOR PONDS, WATER GARDENS & FOUNTAINS – Control algae growth and clear green water – without toxic algaecides or expensive UVs!
  • IMPROVE WATER QUALITY & CLARITY – Safely restore missing nutrients & balance your pond’s chemistry for improved water quality and crystal clear water!
  • ELIMINATE OFFENSIVE POND ODORS – Supercharge your pond’s Nitrogen Cycle and puts beneficial bacteria to work cleaning up waste & pond sludge.
  • PROMOTE THE GROWTH OF DIATOMS & ZOOPLANKTON – The diatoms fueled by Nualgi are quickly hunted down and eaten by zooplankton – the preferred live food for your fish!
  • ENHANCE FISH HEALTH, COLOR, AND ACTIVITY – Koi pond owners will see their fish be more active chasing down their free food while health & color improve from a more balanced diet and overall ecosystem.
  • IMPROVE AQUATIC PLANT HEALTH & GROWTH – Water gardeners will see all their aquatic pond plants flourish once your water chemistry is balanced and missing nutrients restored.
  • INCREASE DISSOLVED OXYGEN LEVELS – For many eutrophic ponds, results may be visible by afternoon on the first dose – starting with the bubbling up of oxygen you can see!

How Many Gallons of Water Does Each Size of Nualgi Treat?

Bottle Size Gallons of Water Treated Cost to treat 5,000 Gallons
60 ml 60,000 $2.08
125 ml 125,000 $1.60
250 ml 250,000 $1.40
500 ml 500,000 $1.15
1 L 1,000,000 $0.97
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273 reviews for Nualgi Ponds – Natural Algae Control + Water Clarifier

  1. Rated 5 out of 5


    Works Well

    Couldn’t use the UV light with my pump due to drop on pressure so bought this which worked within a couple of days to clear the water… for the additives this is most effective

  2. Rated 5 out of 5

    Bob Wallace

    Once a week and correct amount… you got it done.

  3. Rated 5 out of 5

    Mary Rice

    Five Stars

    Love it for my pond!!!!

  4. Rated 5 out of 5


    Outstanding Product!!!

    Best product out there for ponds.

  5. Rated 4 out of 5

    John S.

    Works well on algae

  6. Rated 5 out of 5

    Mary Stiles

    I liked how who only it cleared up the water. Still a work in progress on the algea though. But satisfied with how it’s working. Really nice to see my koi swimming around.

  7. Rated 5 out of 5


    Love It!!!!

    Have been using this product for several years. Love it!

  8. Rated 5 out of 5


    Stream Clean
    Cleared up my waterfall stream within 3 weeks!

  9. Rated 5 out of 5

    Took A Risk

    Highly Recommended
    Worked wonders! Have a 500 gallon pond with everything covered in a dark algae slime. Used the tiny amount as directed and all the slime just disappeared totally within three weeks and the koi and goldfish were unaffected and happy! Definitely use as directed. A very little goes a long way.

  10. Rated 5 out of 5

    Joylin G.

    This is the best product you can add to your pond for healthy fish, plants and a better ecosistem. Im a M biologist, I has been working with ponds for over 20 years, I purchased my first bottle of Nualgi for just check if it really works, and it does. On market theres no miracle product, ylu just need to add the best products for your po d to flourish and rhis is one of the best product I have been dealing with, We use it on several maintnances on ponds, at each depending on the pond acts different ways but one shure thing, the fish are healthier, plants are better and the water quality is now the best shape ever. So buy it, with confidence.

  11. Rated 5 out of 5

    Katie and Gary

    Love this product … I’ve been using it for 3 years now…(in) a 14,000 gallon Koi pond and a much larger natural pond in back….I’m done with paying for products that do nothing and just take money out of my pocket.

    This stuff works.

  12. Rated 5 out of 5


    Helps keep algae away
    Have only been using for two weeks now seems to be working ok, not as fast as would like, but is doing a job.

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