Nualgi Ponds – 500ml

Rated 4.58 out of 5 based on 241 customer ratings
(242 customer reviews)


An innovative approach to improving pond balance, Nualgi Ponds is built on a nano silica base with our patented formula of 12 essential elements that safely help restore the natural balance, improve water quality and control nuisance algae.

Engineered specifically to benefit the health of your aquatic plants and fish, Nualgi Ponds is easy to use, efficient, and yields rapid results.

SKU: np500ml Category:
WHOLESALE DISCOUNT – buy a total of 12 bottles or more and receive 15% off the total order. Go to our Wholesale purchase page to mix and match different sized bottles.


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

When you supplement your regular maintenance with Nualgi Ponds, you will be able to:

  • WATCH YOUR POND FLOURISH – Nualgi Ponds will significantly improve water quality as well as the health of fish and plants. For many eutrophic ponds, results may be visible by afternoon on the first dose– starting with the bubbling up of oxygen, elimination of odor, and Blue Green Algae crashing and floating to the surface.
  • SEE MORE – By reducing nuisance algae growth, Nualgi Ponds improves water clarity and visibility to reveal more of the pond’s environment and its inhabitants.
  • FEED LESS – By restoring missing nutrients, Nualgi Ponds brings balance to the natural marine food chain from the bottom up by promoting the growth of diatoms and zooplakton – free food for your fish and shrimp!
  • SHOW IT OFF – Enjoy peace of mind knowing that your pond is healthy, clear, and odor-free.  Friends and guests will be impressed, and we won’t tell them how easy it was to restore the natural beauty of your pond.
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242 reviews for Nualgi Ponds – 500ml

  1. Rated 5 out of 5

    Jesus L. Opiana

    For pond safety i recommend this product you can see the result no worries losing fish.

  2. Rated 5 out of 5

    Took a risk

    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.

  3. Rated 5 out of 5


    We used this in conjunction with beneficial bacteria and our formerly pea soup pond is now clear after about 2.5 weeks of use.

  4. Rated 5 out of 5


    used one dose and see a difference already

  5. Rated 5 out of 5

    Karen Faulkner

    I tried using this as directed and it did nothing for the 200 gallon tank I had. So I tried doubling the dosage and still had no affect.

  6. Rated 5 out of 5

    Bill D. McArthur

    initially worked to help with string algae. But over the year, it didn’t work as advertised in controlling algae. finally had to drain and clean the pond. After we refilled and added this product, the algae came back

  7. Rated 5 out of 5

    Delores Underwood

    Love this product it may take a few weeks to see results when you first start but after that you will have crystal clear water and beautiful color added to your fish.

  8. Rated 5 out of 5

    Cortney Johnson

    works pretty good, water is super clear

  9. Rated 5 out of 5

    Scott Claason

    great product and great delivery

  10. Rated 5 out of 5

    Donald R. Shickle

    Clears up the pond pretty quickly. Should last long time.

  11. Rated 5 out of 5


    Hello,Nualgi Ponds is a fantastic product! We have a 4500 gallon koi pond and algae began forming in late fall 2017. We applied the product and within two weeks and the algae was completely gone. The water is now crystal clear. Amazing! Will buy again.Thank you!EBS

  12. Rated 5 out of 5

    Ray Las Vegas

    Best product for algae control. The brown after effect is easily removed with a hose. I’ve tried everything else; this is great. Fish don’t seem to be affected by it.

  13. Rated 5 out of 5


    I would recommend this product. It cleared up my pond nicely.

  14. Rated 5 out of 5


    I noticed one thing that most reviewers don’t make clear is what type of algae they were trying to control, whether string algae or the single-cell variety that makes your water look like pea soup. From my experience this product worked very well to eliminate string algae but was absolutely worthless for controlling single-cell (green water) algae. So if you’re trying to control string algae, this product is likely to work very well. However, if you’re trying to control the single-cell (green water) variety, don’t waste your money on this product.

  15. Rated 5 out of 5

    Steven Yokum

    It took a month to see results. Which was stated as a possibility. During that time I did a lot of manual removal of the string algae. I probably scooped 5 pounds out of my pond. I’m not sure this would have been effective without doing that. At this point even the surface of my rocks are starting to clean up. So I’d say it works. I’m wondering if a little string algae may be good for the fish going into winter so today was my last treatment for 2017.I stopped using over the winter and the string algae exploded again. I started manually removing and using this again on my 1000 gallon pond this spring. Took another month, but once again it cleared the string algae out. I’d say manual removal is a must on the big strings

  16. Rated 5 out of 5


    This stuff actually works. Not sure how, but I ,put in 2 mils for a week until algae was under control and now I use 1 mil per week for maintenance. The water is a lot clearer.

  17. Rated 4 out of 5

    Crystal Maddox

    This stuff really does remove algae from my pond!

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