Does this kill water shield, cat tails, willows and algae ?

Hi...yes it does kill water shield, cat tails and other water vegatation as long as you get it spread in close proximity to the base of those plants...not sure about the willows, suspect not because they are above the water. I prefer to keep a little patch of ws and ct so I carefully spreading the granular product allowing me to do that. For algea no...different type of animal...I used Cutrine Plus...spray on algea after it forms...works great other than I have to spray it 4-5 times during the year to keep it under control. Looking for a different product that you toss in and it prevents the algea from starting.

Will this kill Hydrilla?

I used this for leafy pond grass and it kills numerous other. It also takes care of algae. My pond has never looked as clean as it does now.

Do you just throw it in on the algae? I'm asking because mine is broken up in sections I already applied another product and it helped a little but I

That is what we did. This stuff sinks and gets to the roots.. about a week Lily pads started to look burnt and drying up.

River application + I live o. A river in Maine, will this work on weeds under the water?

Hydrotho Granular aquatic herbicide and algaecide for ponds provides rapid-acting contact control for submerged weeds and algae. Hydrothol even works where there is moving water such as a canal or bay area. Hydrothol can be used in combination, in rotation or as an alternative to copper for control of algae. Dosage rates vary depending on what type of algae or weed is being treated and the density of the infestation.

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Hydrothol Aquatic Herbicide 20# Bag- Endothol 11%

Hydrothol Aquatic Herbicide 20# Bag- Endothol 11%

Product ID: 107473470

Details

Active Ingredients
Herbicide
Brand
United Inc
Item Form
Granule
Item Weight
20 pounds
Liquid Volume
9463.52 ml

🌿11.2% Endothall concentration

💧Effective in murky & slow-moving water

♻️Dissipates in <7 days, eco-friendly

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Description

🌊 Clear waters, cleaner future — dominate your pond’s ecosystem with Hydrothol!

TRUSTED LEGACY - Over 30 years of proven performance as the only registered organic aquatic algaecide.
ECO CONSCIOUS FORMULA - Breaks down quickly without bioaccumulating, protecting fish and aquatic ecosystems.
VERSATILE APPLICATION - Works in muddy, slow-moving waters and supports spot or marginal treatments for precision.
RECREATIONAL WATER FRIENDLY - Clears waterways to enhance swimming, fishing, and water sports access.
POWERFUL BROAD SPECTRUM CONTROL - Targets algae & aquatic weeds with 11.2% Endothall for rapid, reliable results.

Hydrothol Aquatic Herbicide 20# Bag delivers 11.2% Endothall in a granular form, offering fast-acting, broad-spectrum control of algae and aquatic weeds. Designed for use in slow-moving or murky waters, it is environmentally responsible with a short half-life under seven days and no bioaccumulation. Trusted for over three decades, Hydrothol enhances water quality and recreational access while safeguarding aquatic life when applied correctly.

Specifications

ASIN	B00QXNR7AE
Active Ingredients	Herbicide
Best Sellers Rank	#31,562 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #93 in Water Garden & Pond Treatment
Brand Name	United Phosphorus Inc
Coverage	1000 square feet
Customer Reviews	4.1 4.1 out of 5 stars (482)
Global Trade Identification Number	39270356680801
Item Form	Granule
Item Weight	20 pounds
Liquid Volume	9463.52 ml
Manufacturer	United Phosphorus Inc
Number of Packs	1
Part Number	6020396
Unit Count	320 Ounce

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How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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$665.74

Duties & taxes included

In stock

Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Ecuador.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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