McGrayel Algatec 10064 Super Algaecide for Green, Yellow and Black Algae, 64-Ounce

4.2 4.2 out of 5 stars | 3,907 ratings

Price: 42.95

Last update: 02-03-2025


About this item

Will not interfere with pool water pH, or sanitizer levels and can swim immediately after treatment
Kills rather than starves algae and prevents algae regrowth due to biostatic inhibitors
Kills most algae in 8 to 24 hours; black algae in 7 to 10 days
Salt pool friendly Formula contains no metals, bromides, or quats; Works synergistically with chlorine for fast cleanup
Super-clarifics pool water during cleanup function

Product information


Top reviews from the United States

  • Kevin Ritter
    5.0 out of 5 stars I had black alges on my pool
    Reviewed in the United States on January 14, 2025
    My pool hasn't looked this good an it keeps on working. I will purchase another gallon for future maintenance. I had some very small green spots around the mosaics but the areas or patches of black algae was hard to fully remove with brushing. I add half of the bottle and 3 weeks later I added the rest of the bottle. I have no algea, black or green and the water is crystal clean. To bad it is winter here and it doesn't matter that its 80* the water is to cold to swim. No heater.
  • Michael R.
    5.0 out of 5 stars Works good.
    Reviewed in the United States on December 8, 2024
    I was buying the super algicide from Pinch A Penny, this product is much cheaper. The chemicals in both are exactly the same except this one is 50%, half as strong as the other one, but the bottle is twice the size, you just have to use twice as much, but even at that it’s still much cheaper than Pinch A Penny.
  • Pamela Rhodes
    4.0 out of 5 stars Recommended by Pool Pro
    Reviewed in the United States on January 17, 2025
    My pool pro recommended this product for some stubborn algae. It eliminated it almost completely in 2 days. This product worked better than others I have tried.
  • Pilot_Skg
    5.0 out of 5 stars Finally Something that Works
    Reviewed in the United States on November 2, 2024
    My pool turned green in late July and it was still green in September. I maintained proper levels, shocked it several times, vacuumed, partial flush…. Nothing worked. I stumbled on this product and decided to give it a try. I shocked the pool and added the full bottle to my 33’ above ground pool. One week later my water was finally getting clear again. Granted, I had a lot to vacuum out of the bottom of the pool but it finally worked. While I hope to never repeat this problem I would certainly recommend this product to others. Just remember it works in combination with chlorine so shock it when you apply it.
  • LizardLvr
    3.0 out of 5 stars I wish these companies would tell the whole story!
    Reviewed in the United States on June 9, 2024
    When it comes to eliminating algae, you're not going to do it without CHLORINE. No matter the product, you're going to need to raise your chlorine to shock level and keep it there. Then, add this product.

    This is discussed in the instructions that you may read only after you've purchased this product or may never read, dump this product in your pool, and then be annoyed because it doesn't work.

    Don't even get me started on the "yellow" products. At least when compared to the "yellow" products, this one still allows for an accurate chlorine reading after its been added to your pool and you don't have to drain your pool to get rid of it.

    Overall, I do like the products this company offers but wanted to provide full discourse for them on this one.

    I hope this review helps someone out.
  • Just received this little fan. I was absolutely amazed at the power of this little fan. I am recommending this fan to family. Wow
    5.0 out of 5 stars It works.
    Reviewed in the United States on August 7, 2024
    It works great. I've used that junk that said it was going to get rid of algae and you have to treat your pool for like 3 days, it does not work. I know that algaecide works I've used algaecide before but never this brand. I was worried it wouldn't work. The other brand was the color of iodine and would stain anything it touched so you had to be extra careful with it. My pool was so green I couldn't see the bottom. My algae was gone the next morning. It was cloudy but I expected that. I will definitely be buying this again for sure. Love this stuff.
  • Amazon Customer
    1.0 out of 5 stars Save your money and buy something else this doesn't work
    Reviewed in the United States on April 24, 2023
    With the economy in the toilet and car prices through the roof The most expensive place you could ever want to visit is the supermarket You have to be very careful about what you buy This product that I purchased was supposed to kill algae I ran the pump for 8 hours before using the product The pool is Crystal Blue I just had some light forms of green on the surface of the Diamond Bright finish it's a 20,000 gallon swimming pool so I use the whole bottle but before I used the bottle I scrub the pool to get the algae off the surface This product did absolutely nothing I waited 12 hours and I scrub the pool again and all I got was clouds of of white powder you couldn't even see the bottom of the pool Two days later still algae at the bottom of the pool I've added two and a half gallons of 12% chlorine right before using the product and I use 12% chlorine today if you want to save yourself some money buy something else Because this product doesn't work I purchase something from Lowe's and I poured it into the pool and within less than 45 minutes You could see it cleaned everything you could watch it it was like a wave that came from the right side of the pool to the left side of the pool and everything was completely clean There was nothing left on the surface that even resembled any form of algae or green and I want to make one thing clear this pool was Crystal Clean and blue it just had a surface amount green algae in spots One true and honest review
  • Opie
    5.0 out of 5 stars Works great!
    Reviewed in the United States on September 28, 2024
    This is a bit pricier than other algaecides I've used in my pool. But it works so good it's worth the extra money

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