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

    Diane R. (verified owner)

    My 1500 gal pond in AZ has 340 days of 80 degree plus temps, sunny and high temps so, I have battled algae for years. So imagine my surprise when this 12 oz bottle of algae control arrived I used the small dropper to add the 1.5 mls of product to my pond. That was 4 weeks ago my pond remains crystal clear with just this 1.5 mls a week being added. Love this product!

  2. Rated 5 out of 5

    Jimmy N. (verified owner)

    Excellent product after one week the water super clear and fish seem happier. Glad I found this!
    Thank you.

  3. Rated 4 out of 5

    Susie F. (verified owner)

    Very happy so far….I have only done 3 treatments but the water is clear and the string algae on the waterfall seems to be lessening.


    It’s been two and a half weeks since I turned the uv off and started nualgi. My water is the absolute clearest it has ever been. Water temp has come up steadily in the past few weeks and is now at 65.

  5. Rated 5 out of 5


    I’ve been using Nualgi since Sept. of last year. I use it in two ponds both which have had green water issues. One pond it seems to be working very well, I have had significantly clearer water since I started using it. The other pond I keep water lily’s in and I feed the lily’s pretty heavy, I just don’t think that the product can handle the fertilizer load I put on this pond. I will say that I have noticed a savings on the amount of electricity used since I have not had to run the 110 watt or the 55 watt UV lights since I started using.

  6. Rated 5 out of 5

    Kathy Guraro (verified owner)

    I was lucky enough to meet Anil, the president of Nualgi at the Fresno Koi show. He was kind enough to give me a sample bottle of his product. I put a little in my pond which was soupy green with Algae and within 2 days my pond was Gin clear and I was able to see Koi that I haven’t been able to see for a long time in my Koi pond. I recommend this product to anybody that wants to see their pond crystal clear. Thank you Anil. I am very satisfied and happy with this product.

  7. Rated 5 out of 5

    Pete Tyler (verified owner)

    If you have a pond and having trouble with green water, you have tried everything to clear it up, and have had no success. Then you need to try Nualgi. I had long string algae used Nualgi, cleared it up. My friends have used it, same results. By the way fish are heather and color intense.

  8. Rated 5 out of 5

    Chien H. (verified owner)

    After using it for 6 months and without UV, my pond water is crystal clear! My koi are active and maintain their coloration without using any color enhancing feed. The skin is always shining.

  9. Rated 5 out of 5


    Incredible! This is the only product that has cleared up my ponds and my water gardens. I am especially happy and surprised that my natural pond with no filtration now has clear, clean water with no earthy odor add it always had before. My filtered ponds are getting almost Crystal clear and are cleaner than they have ever been. Thank you to whomever is responsible for this product formulation because the time and money it saves me is a blessing. Can’t forget how happy I am to be able to see my Koi ask the time. Even my lighting in the water stays clean so they shine bright.

  10. Rated 5 out of 5

    The Constant Gardener (verified owner)

    Been using Nualgi in my pond for several months now. Love the look of the water. Haven’t used the UV for months now. A great new product.

  11. The Constant Gardener (verified owner)

    Been using Nualgi in my pond for several months now. Love the look of the water. Haven’t used the UV for months now. A great new product.

  12. Rated 5 out of 5

    Ladyann H.

    My pond is crystal clear now, less filter cleaning, healthier happier fish. Thank you Nualgi

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