API POND ALGAEFIX Algae Control 32-Ounce Bottle, FISHAQUARI (169G)
Original price was: $34.98.$15.48Current price is: $15.48.
Price: $34.98 - $15.48
(as of Oct 23, 2025 03:51:37 UTC – Details)
Fast-acting API POND ALGAEFIX Algae Control works to control algae growth in ponds, water gardens, and fountains, keeping water clean and clear. API POND ALGAEFIX Algae Control works to control Green or Green water algae, String or Hair algae and Blanketweed. Will not harm fish and plants when used as directed. API POND ALGAEFIX Algae Control is for pond and fountain use only, where water is contained without any outflow. Ponds must have adequate aeration to maintain sufficient oxygen levels for fish, especially in warmer weather. To determine accurate dosing for your pond size, measure the pond volume before use. Do not use with freshwater crustaceans, including shrimp, crabs, and lobsters. With API POND products, it’s easy to keep a beautiful pond. For almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world. They work to provide a safe, hospitable environment for fish such as koi, catfish, perch, goldfish and more. At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too.
Is Discontinued By Manufacturer : No
Product Dimensions : 3 x 4.5 x 7.5 inches; 2 Pounds
Item model number : 169G
Department : Pond
Date First Available : October 2, 2003
Manufacturer : Mars Fishcare
ASIN : B000HCKVGE
Best Sellers Rank: #421 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden) #1 in Water Garden & Pond Treatment
Customer Reviews: 4.2 4.2 out of 5 stars 9,981 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Contains one (1) API POND ALGAEFIX Algae Control Solution 32-Ounce Bottle
Effectively eliminates green water algae, string and hair algae, blanketweed algae and others
Controls green water to keep pond water clean and clear in ornamental ponds and water gardens
Use as directed to keep water safe for fish, pond plants, surrounding wildlife and pets
Dose every three days until algae is controlled and then treat weekly
Customers say
Customers report that the water treatment works wonders on ponds, making water clear within 24 hours and keeping it crystal clear through summer. The product receives positive feedback for its effectiveness, with customers noting it’s safe for koi and goldfish and doesn’t harm fish or plants. However, there are mixed experiences with algae control – while some say it eliminates algae completely, others report it doesn’t stop growth. Moreover, there are concerns about fish safety and value for money, with some customers reporting fish deaths and finding it expensive to use repeatedly.
13 reviews for API POND ALGAEFIX Algae Control 32-Ounce Bottle, FISHAQUARI (169G)
Add a review
Related Products
Original price was: $34.98.$15.48Current price is: $15.48.
Nanc –
Crystal clear water all year!!
Tried others none of them worked as well as this one did! We didnât have any mold or algae all summer, water was crystal clear. Will purchase this again and again! Recommend highly for water fountains.
janet smith –
Works well in my small pond with koi
This product works well in my small pond with koi. Very happy with results
RandomCorkie –
MUST READ. It WILL NOT kill your fish IF……
LONG REVIEW, BUT PLEASE READ!!!Okay, so my pond is in 100% full sun so I have been dealing with warm, pea soup chlorella (planktonic) algae bloom all summer long. Not bad for the koi, but unsightly to the eye. All I wanted was to see the bottom of the pond and my koi through crystal clear water. Isn’t that what all of us koi pond owners want? Well, I finally caved and decided (per my brothers recommendation) to start looking into a non-copper algaecide. I am very familiar with APi products and trust the company, but after doing research and reading up on plenty of positive and negative reviews I was a bit leery in adding an unpredictable and unnecessary chemical to my pond, but I was so tired of the not seeing the true beauty of my koi and the green water didn’t smell great either. Please note that all water parameters are spot on: Ammonia 0, Nitrite 0, Nitrate 0, PH 8.2 (evening), KH 14 Drops. Pond is approximately 5000 gallons with a lot of filtration (won’t bore you with those details), including a UV filter, as well.Anyway, I called the company and left a voicemail for them to call me back because I had some questions regarding the negative reviews. They did return my call, but I missed it and I never called them back. I decided to purchase the product and dose carefully. A few things I know is that aeration plays an important part when using any algaecide. IT IS THE MOST IMPORTANT THING…..BUT…..Here is my experience with using this algaecide.So, my first treatment went very good, fish acted very normal and they didn’t seem to notice anything different. I (Please note; I added each treatment along with a natural cleaning bacteria to help break down decaying algae) By day two I noticed a slight clarity in the water. It was definitely working. I did a 10% water change at the end of day two. I waited the recommended three days before doing a second treatment. My second dose went just as well. No issues and koi were just fine. By the end of my second treatment, I could see three feet down! That’s 6 days after the first treatment and water was much more clear. It was working! Now, on day 6 before my third treatment I did a 20% water change to help remove the dead chlorella in the water column and did that using my go-to dechlorinator Sodium Thiosulfate. My intention was to add my third and final dose the next day but I forgot and I added the algaecide right after the water change. As soon as I added it I knew it was a BIG MISTAKE not to have waited at least 24 hours after the water change! DO NOT MIX THIS PRODUCT WITH ANY OTHER CHEMICALS WITHIN AT LEAST 24 HOURS OF USING THIS PRODUCT! All of my koi almost instantly disappeared to the bottom of the pond and some were seen darting around. I though I just killed my beloved koi and there wasn’t much I could do about it. Doing another water change with the necessary dechlor would probably do more harm than good so I added 10 lbs of charcoal to the waterfall. I didn’t see my koi at all the rest of the day. I thought for sure I would wake up to 27 dead koi in the morning. However, I woke in the morning to find all my koi swimming happily around looking for their breakfast.So my suggestions: AERATE AERATE AERATE (simple waterfall isn’t enough aeration) and DO NOT use with ANY other chemicals, especially dechlorinators such as Sodium Thiosulfate. I HIGHLY recommend NOT doing water changes within AT LEAST 24 hours of using this product. That is what will be detrimental to your koi and other fish. If fish show signs of stress, increase aeration and add carbon to remove the chemical agaecide.So, in conclusion, here are the pros and cons of this product:PROS:~Is highly effective against chlorella algae blooms (pea soup syndrome, I call it) Knocks back Chlorella blooms withing a day or two~Works fast~Easy to dose~Cost effectiveCONS:~Will harm your fish if used within 24 hours of doing a water change with dechlor (should say on the bottle, but doesn’t). API should put that on the bottle. ALWAYS AERATE.~Does turn dead carpet/hair algae a very ugly black color after killing it. But that’s normal.Hope this helps!Took a LOT longer to see results in killing the little amount of spring algae I had in the pond, but that wasn’t my target.
boom –
Hooray!
Works fast, water cleared and stays clear. Wish I found this sooner. It would’ve saved me from cleaning out my small pool/waterfall echo month.
Shelly –
Must for my pond
I have had to use a couple times this year. And it works quick with killing the algae makes it use for me to clean it out of pond. Water is clearest itâs been in three seasons.
Phil Foster –
Be Patient
It took a year to remove the Algae. The water is currently clear. I did add chlorine tablets to the water.
James –
NOT safe for fish !!!
So I ordered this because I had an algae problem in my koi pond and followed the directions as closely as I possibly could. After adding the fish back to the water ( I removed them all for a deep cleaning of the liner ) I noticed somw of them acting weird and jumping and gasping for air , others were just lifeless on the bottom, a couple goldfish seem to have even aquired neurological problems. Doing the twirling death spiral and sinking to the bottom . None of them were eating , which is very strange as all of them had great appetites before. I had to act fast and remove them and do a 100% water change to remove all the product from the water. Luckily I managed to save them all . I DO NOT recommend this for fish as it is clearly not safe. Even if you have all the aerator and pumps going as I did. Maybe safe for fountains with no fish or plant life? I threw the rest away and would NEVER buy this product again. Almost cost me hundreds of dollars in livestock as my koi were very expensive.
L Zigler –
Algaefix Works!
For many years, felt I had tried just about everything to keep my outside fountain algae free. Nothing worked.Until I took a chance on this. OMG!!! Sooo pleased with results! Highly recommend, it does what it promises
Radhika leela –
excellent
Very good –
It works but expensive for ponds
Pakariverman –
Amazing results on just two days. Two months of algae bloom due continuous rain and sunny weather. Never experienced this in with my pond before. Fishes could no longer be seen.Fantastic API Algaefix …My pond is restored to be crystal clear again.
Amazon Customer –
This does a good job at keeping the algae at bay in my outdoor fish pond, and also the warning on the product, that tells you to make sure your pond is aerated during hot eather o you will loose your fish, this warning is not on products sold in Australia
aussie bloke –
Easy to use, effective