I got a ick treatment for my 2 golfish in my 29 gallon tank?

it says to take out the carbon so odes that mean the filter cartridge and then add 1 teaspoon for every 10 gallons.it says repeat regimen ever 3 day????also says 24 hours later do a 50 % water change.im just confused on whaty do do if i take out filter cartridge for how long and need help.