GreenClean Granular Algaecide 20 lb
GreenClean Granular Algaecide 20 lb
$8868
GreenClean Granular 20 lb is a fast-acting granular algaecide for ponds, waterfalls, fountains, and listed surfaces. Its white sodium carbonate peroxyhydrate granules work on contact, show visible treatment cues quickly, and give you curative and maintenance options for an easier algae routine.
- Fast visible action; bubbling and bleaching cues appear soon after treatment
- Built for algae hot spots; ideal for string algae, green water, and surface growth
- Flexible routine; use stronger curative rates or lighter maintenance rates
- Fish-and-plant fit; labeled for water features with live fish and plants
- Wide site range; use on ponds, fountains, waterfalls, patios, and roofs
- Compact 20 lb pail; easy to keep on hand for backyard touch-ups
Choose the 20 lb size for fast seasonal control without a bulkier bucket.
Always follow label directions.
Recommended companion treatment program
NT-MAX Koi and Garden Pond Clarifier + Sludge & Muck Digester, 9 lb Rapidly restore clearer, healthier water in koi ponds, decorative garden ponds, and small residential water features with NT-MAX,….
After using Greenclean Granular Algaecide, wait about 5 days before applying NT-MAX Koi and Garden Pond Clarifier + Sludge & Muck Digester, 9 lb.
Bundle savings may be available below when eligible.
Frequently bought together
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Product Description
Fast granular algae control for ponds, waterfalls, fountains, and surfaces
GreenClean Granular gives pond owners a copper-free way to knock back algae in water features and on non-painted surfaces. The granules are easy to broadcast where growth is heaviest, and they give you both curative and maintenance options for faster cleanup and steadier upkeep. The 20 lb pail suits backyard ponds, fountains, waterfalls, and cleanup work.
Key Features & Benefits
| Feature | Benefit |
|---|---|
| Sodium carbonate peroxyhydrate | Fast contact oxidation helps knock back algae without copper. |
| White granular solid | Easy to broadcast to problem areas or measure for repeat care. |
| Water and surface uses | Useful for ponds, fountains, waterfalls, patios, roofs, and other sites. |
| Curative and maintenance rates | You can match treatment strength to active growth or ongoing upkeep. |
| 20 lb pail | Easy to store and sized for routine backyard treatment. |
Directions & Dosing Snapshot
| Use Case | Label Rate | Application Notes |
|---|---|---|
| String algae treatment | 1 Tbsp per 50 gal to 1 cup per 1,000 gal; 5 cups per 5,000 gal; 10 cups per 10,000 gal | Check pH, apply early morning, turn off water movement, then restart after 45 minutes. |
| Green water algae | High: 1 Tbsp per 50 gal to 10 cups per 10,000 gal. Low: 1/2 tsp per 50 gal to 2 cups per 10,000 gal. | Use high rate for shock treatment. Low rate may be used 1 to 3 times weekly with beneficial bacteria. Not approved in California. |
| General treatment, small volume | Heavy: 3 to 16 Tbsp per 1,000 gal. Maintenance: 1 to 5 tsp per 1,000 gal. | For backyard water gardens, ornamental ponds, and ornamental waterfalls. |
| General treatment, large volume | Heavy: 90 to 500 lb per million gal or 30 to 170 lb per acre-foot. Maintenance: 9 to 50 lb per million gal or 3 to 17 lb per acre-foot. | For larger containerized residential ponds or water gardens. |
| Surface treatment | Non-painted surfaces: 4 to 6 cups per 1,000 sq ft heavy, 2 to 4 cups low. Ground surfaces: 2 to 3 lb heavy, 1 to 2 lb low. | Apply over a wet surface or activate with water. For dissolved solution, use at least 1 gal water per 0.5 lb. |
Always follow the full label for complete directions, restrictions, and site-specific requirements.
This product is distributed by NewTechBio as an authorized reseller. Specifications, treatment rates, and performance claims are sourced from the official EPA-approved manufacturer label and published documentation. NewTechBio does not independently verify manufacturer claims. Always read and follow the label.
Last updated for listing accuracy: 04/27/2026
What is GreenClean Granular 20 lb used for?
How much GreenClean Granular should I use per 1,000 gallons?
How fast does GreenClean Granular work on algae?
Can I use GreenClean Granular in a pond with fish and plants?
Does GreenClean Granular treat green water algae and string algae the same way?
How often should I reapply GreenClean Granular?
How much area does an 20 lb container cover?
Can GreenClean Granular be used on patios or walkways?
Should I use beneficial bacteria with GreenClean Granular?
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Product Details
SKU: NTBIO3744602-20
UPC: 188716000405
Category: Algaecides, Mold & Mildew Control
Brand: BioSafe Systems
Weight: 21 lbs
Dimensions: 12 x 9 x 10 in
Important Information
SDS: View Safety Data Sheet (PDF)
LABEL (Directions & Rates): View Product Label (PDF)
Comments/Other: Review the Product Label and SDS for directions, rates, and safety information.
Certifications / Registrations: EPA registered, OMRI Listed
Origin: Made in the USA
Feature: Water-dispersible granule
Product Form: Granular
Product Details
Fast granular algae control for ponds, waterfalls, fountains, and surfaces
GreenClean Granular gives pond owners a copper-free way to knock back algae in water features and on non-painted surfaces. The granules are easy to broadcast where growth is heaviest, and they give you both curative and maintenance options for faster cleanup and steadier upkeep. The 20 lb pail suits backyard ponds, fountains, waterfalls, and cleanup work.
Key Features & Benefits
| Feature | Benefit |
|---|---|
| Sodium carbonate peroxyhydrate | Fast contact oxidation helps knock back algae without copper. |
| White granular solid | Easy to broadcast to problem areas or measure for repeat care. |
| Water and surface uses | Useful for ponds, fountains, waterfalls, patios, roofs, and other sites. |
| Curative and maintenance rates | You can match treatment strength to active growth or ongoing upkeep. |
| 20 lb pail | Easy to store and sized for routine backyard treatment. |
Directions & Dosing Snapshot
| Use Case | Label Rate | Application Notes |
|---|---|---|
| String algae treatment | 1 Tbsp per 50 gal to 1 cup per 1,000 gal; 5 cups per 5,000 gal; 10 cups per 10,000 gal | Check pH, apply early morning, turn off water movement, then restart after 45 minutes. |
| Green water algae | High: 1 Tbsp per 50 gal to 10 cups per 10,000 gal. Low: 1/2 tsp per 50 gal to 2 cups per 10,000 gal. | Use high rate for shock treatment. Low rate may be used 1 to 3 times weekly with beneficial bacteria. Not approved in California. |
| General treatment, small volume | Heavy: 3 to 16 Tbsp per 1,000 gal. Maintenance: 1 to 5 tsp per 1,000 gal. | For backyard water gardens, ornamental ponds, and ornamental waterfalls. |
| General treatment, large volume | Heavy: 90 to 500 lb per million gal or 30 to 170 lb per acre-foot. Maintenance: 9 to 50 lb per million gal or 3 to 17 lb per acre-foot. | For larger containerized residential ponds or water gardens. |
| Surface treatment | Non-painted surfaces: 4 to 6 cups per 1,000 sq ft heavy, 2 to 4 cups low. Ground surfaces: 2 to 3 lb heavy, 1 to 2 lb low. | Apply over a wet surface or activate with water. For dissolved solution, use at least 1 gal water per 0.5 lb. |
Always follow the full label for complete directions, restrictions, and site-specific requirements.
SKU: NTBIO3744602-20
UPC: 188716000405
Category: Algaecides, Mold & Mildew Control
Brand: BioSafe Systems
Weight: 21 lbs
Dimensions: 12 x 9 x 10 in
SDS: View Safety Data Sheet (PDF)
LABEL (Directions & Rates): View Product Label (PDF)
Comments/Other: Review the Product Label and SDS for directions, rates, and safety information.
Certifications / Registrations: EPA registered, OMRI Listed
Origin: Made in the USA
Feature: Water-dispersible granule
Product Form: Granular
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Reviews
Verified Purchase
Spoke with Corey about our slime issue and he was so helpful. The Greeclean works well. We treat 1/4 of the pond at a time with it.
Verified Purchase
Pond is approx. 200 gal. Falls were covered. Got rid of the green in 3 days. Much improved.
Verified Purchase
We had string algae on our fish pond rocks and after sprinkling this directly on the algae, it was dead in 4 hours. Needed to turn the pump off per instructions and wait a while. Excellent control product. Shout out to John at newtech super helpful and knowledgeable.
Verified Purchase
2 hours and the algae is gone!!!
Verified Purchase
This product kills the algae and apparently birds if the eat from the open container. Just need to scoop out what you need and put the container back on fast.
Verified Purchase
Worked well. Recommend.
Verified Purchase
Best stuff I've used so far that did not kill ANY fish! Highly recommend. Thanks!
Verified Purchase
We always had issues with our koi pond starting 1 week after we installed it. This product works well at killing off the green. We use this with ntmax and the water stays clean and healthy.
Verified Purchase
First go around I almost killed my fish by adding too much. Luckily I was able to move them to my other pond and did a water change. Lesson learned but otherwise good product.
Verified Purchase
Does what it says
Verified Purchase
I tried algaefix and half a dozen other products and this one works. Algae floats to the surface fast so need to scoop it out.
