Works in 1 week, for very thick algae may require a second dose.
Safe for all plants, and fish.
Will control algae and green water in cold water aquaria and ponds
Add 5ml per 300ltrs of water.
Windsor fish hatchery has been selling this product for the last 30years and has found it to be very successful in getting rid of most types of algae and green water, whilst still being safe for all your pond inhabitants, including fish,plants,frogs etc. Easy dose weekly will keep the pond free of algae through out the summer months.