You are buying a 3 doses of deworming powder with detailed instructions - (Read instruction below)
Useful against Planaria, Hydra, Scutariella, Vorticella and can also be used to deworm fish like goldfish and Guppies.
Dose on day 1, 3, 5
On day 7 do a normal water change, you can also use activated carbon to remove any medication.
May float on surface for a day before being dissolved which is normal.