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Waterlife Algizin P -Is a blanketweed destroyer which normlly gets to work and shows reaults within 1 week.Algizin P works fast to destroy blanketweed - results can usually be seen within 1 week ! Waterlife's popular Algizin P product is a true algicide (as opposed to an inhibitor) and as such it is registered with the HSE. Algizin P is blanketweed specific it will not harm oxygenating plants lillies marginals or other aquatic plants. Algizin P is also safe with fish and filtration Repeat use during the growing season every 4 to 6 weeks or when re-growth occurs.