The Pond Guy Hydrothol Aquatic Algaecide & Herbicide

The granular form is designed to sink directly to the bottom of your pond, allowing you to target submerged vegetation and bottom-growing algae precisely where it lives. Unlike liquids, which can drift or dilute quickly in the water column, these granules stay localized, making them ideal for spot-treating specific areas like docks or shorelines.

While Hydrothol is effective at controlling weeds and algae, it must be applied carefully according to the label instructions to ensure the safety of fish and other aquatic life. Always check the specific dosage rates for your pond's volume to avoid over-treatment, which can deplete oxygen levels as the vegetation decomposes.

No, this formula is specifically engineered to target bottom-growing algae and Chara. It is not a broad-spectrum solution for all floating algae types, so you should identify your specific weed or algae problem before applying to ensure it is the right tool for the job.

Because this is a fast-acting formula, you should begin to see the effects on targeted vegetation within a few days of application. The speed of the results can vary slightly depending on water temperature and the density of the growth.

It is generally recommended to treat your pond in sections rather than all at once, especially if you have a significant amount of vegetation. Treating the entire area simultaneously can cause rapid decomposition of the weeds, which may lead to a dangerous drop in dissolved oxygen levels for your fish.