{"product_id":"united-phosphorus-inc-hydrothol-aquatic-herbicide-20-lb-bag-endothall-11-granular-for-spot-aquatic-weed-algae-control","title":"United Phosphorus Inc Hydrothol Aquatic Herbicide 20 lb Bag — Endothall 11% granular for spot aquatic weed \u0026 algae control","description":"\u003cp\u003e\u003cstrong\u003eHydrothol Aquatic Herbicide is an 11% endothall granular formulation designed to control algae and nuisance aquatic plants in lakes, ponds, canals and marginal zones.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis granular Hydrothol (Endothall 11.2% mono salt) in a 20-pound bag is formulated for targeted aquatic weed and algal control where spot or sectional treatments are needed. Because the product acts rapidly and dissipates quickly, it is used by public works, pond managers and commercial applicators to reopen recreational access, manage noxious weeds and reduce problematic algal growth. Always follow label directions and local permitting requirements before applying; liquid forms exist but are restricted to licensed commercial operators in many jurisdictions.\u003c\/p\u003e\n\n\u003ch3\u003eHow quickly does Hydrothol work and how long does it persist?\u003c\/h3\u003e\n\u003cp\u003eHydrothol begins affecting susceptible algae and plants soon after proper application, with visible decline often within days under active growth conditions. Its environmental persistence is short; Hydrothol breaks down rapidly in water and sediment, helping limit long-term residues.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVisible control commonly appears within several days of treatment.\u003c\/li\u003e\n  \u003cli\u003eReported environmental half-life typically under seven days when used as directed.\u003c\/li\u003e\n  \u003cli\u003eDoes not tend to bioaccumulate in fish or bottom sediments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhere is Hydrothol best applied and how should treatments be targeted?\u003c\/h3\u003e\n\u003cp\u003eHydrothol is most effective for spot, marginal or sectional treatments in slow-moving waters such as ponds, lakes, drainage ditches and irrigation canals. Because treatments can affect fish if misapplied, applications are commonly made from the shoreline outward or in strips to avoid trapping aquatic life.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIdeal for shoreline, nuisance weed beds and localized algal blooms.\u003c\/li\u003e\n  \u003cli\u003eSuitable for muddy or murky water because it remains active despite suspended sediments.\u003c\/li\u003e\n  \u003cli\u003eUse sectional or spot treatments rather than whole-lake applications unless under a qualified applicator's direction.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat safety and regulatory considerations should I know before using Hydrothol?\u003c\/h3\u003e\n\u003cp\u003eHydrothol must be used in accordance with the product label and local regulations; in many areas permits or certified applicator status are required for aquatic herbicide applications. Proper application patterns and rates reduce risk to fish and non-target organisms and help ensure environmentally responsible control.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCheck and comply with local permitting and label requirements before treating.\u003c\/li\u003e\n  \u003cli\u003eOnly marginal or sectional treatments are normally recommended to minimize ecological impact.\u003c\/li\u003e\n  \u003cli\u003eApplications should be planned to avoid trapping fish in treated zones.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich types of algae and aquatic plants does Hydrothol control effectively?\u003c\/h3\u003e\n\u003cp\u003eHydrothol is a broad-spectrum organic aquatic algaecide historically used against a wide range of filamentous and planktonic algae and many nuisance submerged and emergent weeds. Efficacy can vary by species, strain and environmental conditions, so scouting and correct timing during active plant growth improve results.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCommonly applied against filamentous algae and dense surface mats.\u003c\/li\u003e\n  \u003cli\u003eAlso used for control of select submerged and marginal weeds when applied properly.\u003c\/li\u003e\n  \u003cli\u003ePerformance depends on species susceptibility and environmental factors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: Hydrothol 20# granular is intended for pond managers, municipal and irrigation districts, landscapers servicing water features, and licensed commercial applicators who need a targeted, short‑lived herbicide\/algaecide option. It is suited to situations requiring quick control of nuisance algae and weeds without long-lasting residues, provided label directions and local regulations are followed.\u003c\/p\u003e\n\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I apply Hydrothol myself without a permit?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Regulations vary by location; check label and local rules—many jurisdictions require permits or certified applicators for aquatic herbicides.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will Hydrothol harm fish or persist in sediment?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: When used as directed for sectional treatments it has a short half-life and does not typically bioaccumulate, reducing long-term sediment or fish residues.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"United Phosphorus Inc","offers":[{"title":"Default Title","offer_id":56800506118484,"sku":"B00QXNR7AE","price":209.87,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1063\/2652\/4244\/files\/united-phosphorus-hydrothol-20lb-front-bag.jpg?v=1786737882","url":"https:\/\/gardenluxe.co.uk\/products\/united-phosphorus-inc-hydrothol-aquatic-herbicide-20-lb-bag-endothall-11-granular-for-spot-aquatic-weed-algae-control","provider":"Gardenluxe Uk","version":"1.0","type":"link"}