CrystalClear® AlgaeOff®

Controls Algae in Ponds

Cannot be shipped to: Cannot be shipped to AK, HI, PR, or Canada.

Please select an option.

  • 2.5 Pound
  • Item: CC074-2
  • $31.41
  • 8 Pound
  • Item: CC074-08
  • $71.41
  • 25 Pound
  • Item: CC074-25
  • $142.84

Kills & Removes
Fast Acting
Works on Contact
No More
Will Not Harm Fish
or Ornamental Plants
Great for Rocks, Streams
& Waterfalls




CrystalClear AlgaeOff utilizes the latest in oxygen technology to remove string algae quickly and efficiently. CrystaClear AlgaeOff is an EPA registered granular algaecide that works on contact. Kills and removes algae on rocks, streams and waterfalls.

AlgaeOff cannot be shipped to Alaska, Hawaii, Puerto Rico or Canada.



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Video -AlgaeOff
5-Step Algae Control Plan
Product Label - 2.5 Pound
Product Label - 8 Pound
Product Label -25 Pound
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How to Use

2.5 Pound
8 Pound
25 Pound
Application Granular Powder Granular Powder Granular Powder
Temperature Restriction None None None
Surface Area Treated per Container Up to 1,000 Square Feet Up to 4,000 Square Feet Up to 10,000 Square Feet
Shelf Life 5-Years 5-Years 5-Years


Surface Area
(In Square Feet)
(As Needed)
25 - 50 Square Feet 1/4 Cup
51 - 100 Square Feet 1/2 Cup
101 - 150 Square Feet 3/4 Cup
151 - 200 Square Feet 1 Cup
201 - 250 Square Feet 1-1/2 Cup
Please note: Above are recommendations for light algae growth. Dosage rates may double with heavier growth. Always read the product label.

When to Use

AlgaeOff can be used as needed to kill or remove actively growing algae at the prescribed rate to treat existing algae growth. AlgaeOff is ideal for rocks, streams and waterfalls.

How to Apply

AlgaeOff is water activated. Apply AlgaeOff granules over a wet surface that has algae growth or activates with water immediately following application. For waterfall applications, turn off waterfall pumps and allow AlgaeOff to sit on the waterfall for a period of 20 minutes and then turn pumps back on.

Skim the dead algae or organic material that rises to the water's surface after treatment. This will keep dead organics from sinking to the bottom of the pond. Dead and decaying organics provide a food source and additional nutrients for future algae blooms. Allow 48 hours between consecutive treatments.

For liquid applications, please follow all label instructions. Due to solubility, AlgaeOff is not as effective with this application method.


After application, do not allow undiluted granules to remain in an unsupervised area where humans or animals are exposed.

Be careful when applying granules. Non-targeted plants will suffer contact burn if undiluted granules are accidentally spilled on them.

AlgaeOff cannot be shipped to Alaska, Hawaii, Puerto Rico or Canada.

Product Notices:

Keep product away from children and pets when not in use. AlgaeOff becomes hazards to humans and domestic animals - if absorbed through the skin or swallowed.


Accessories & Related Items




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CrystalClear is committed to product quality and your satisfaction. If you have any questions regarding the use of our products please don't hesitate to contact us. We would be happy to hear from you.

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Item Numbers and UPC

Item Number
UPC Code
CC074-2 023796000597 2.5 Pound
CC074-08 810089840219 8 Pound
CC074-25 023796000610 25 Pound

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