Fluval ClearX helps create clean and healthy living conditions for fish. It effectively traps and controls phosphate, nitrite and nitrate, while eliminating cloudy water, odors and discolorations.Fluval ClearX+ chemical filter media+ improves water conditions for long lasting cleaner surfaces, reducing overall maintenance+ eliminates cloudy water, odors and discolorations+ use ClearX in conjunction with your regular water change and cleaning routine+ suitable for all filtration types+ easily drops into all clip-ons for internal/external filters+ for best results change pad every 2 weeks+ 1 pad treats aquariums up to 60 L+ convenient 3+1 bonus pack format