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

    Ray Las Vegas (verified owner)

    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.

  2. Rated 5 out of 5

    Nancy (verified owner)

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

  3. Rated 2 out of 5

    Gardot (verified owner)

    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.

  4. Rated 5 out of 5

    Steven Yokum (verified owner)

    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

  5. Rated 5 out of 5

    John (verified owner)

    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.

  6. Rated 5 out of 5

    Crystal Maddox (verified owner)

    This stuff really does remove algae from my pond!

  7. Rated 5 out of 5

    Katie And Gary (verified owner)

    Love this product … I’ve been using it for 3 years now and just wish they offered a larger size and brought their price down a bit. We have a 14,000 gallon Koi pond and a much larger natural pond in back that we cannot afford to properly treat. Sell me a gallon size and give me a break on the price please. I’m done with paying for products that do nothing and just take money out of my pocket.This stuff works.

  8. Rated 5 out of 5

    Trevorm (verified owner)

    This product worked as advertised. Excellent for my pond.

  9. Rated 5 out of 5

    Francs D. Irwin, R.N. (verified owner)

    Wow, we had emptied our pond and cleaned out the slug for years of accumulation. It was hot when we refilled it and within a couple of days we had really sick water, smelled, brackish, ugly. I put 1.5 cc’s in it daily for a few days and the water cleared, the smell was gone. Its now stable with putting 1.5 cc in once a week. Ready for fish now. Had lost our fish last winter. Some had been in this pond for 13 years. Nearly everyone in our area lost their fish last winter. The best product I’ve ever used for controlling algae and muck. The water lilies are thriving.

  10. Rated 5 out of 5

    Patricia (verified owner)

    Wow! This stuff really works??. I had been useing a UV light. That worked sorta, but made a lot of sludge on the bottom of my 6000 gallon pond ( a real pain to clean every 2 weeks). I started useing this product after I had cleaned the pond and it has been over 2 months and only a small amount of sludge. I could probably use a bio lift and that would clean uo the small amount that has accumulated. Make sure you turn off the UV light if you have one. This works!!!!

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