Replacement cartridge
Requires an Eau Pure shower-filter housing. One cartridge lasts 3–6 months, depending on your household.
1 replacement cartridge, replacement instructions.
Fit it, shower with it for up to 30 days and judge it in your own bathroom. If it isn't right for your shower, send it back, even used.
What the water passes through
Multiple layers of filtration media, with several materials repeated through the stack. Here's what each main one is there for.
PP cottonHelps capture sediment and rust particles
KDF-55Copper-zinc media commonly used for chlorine reduction
Calcium sulphiteDesigned for use with hot water
Activated carbonHelps address unwanted odoursA simple free-chlorine comparison
Same shower source. Tested using DPD No.1 free-chlorine reagent.

The filtered sample produced a visibly lighter colour response.
DPD No.1 turns pink when free chlorine is present. One at-home test; results depend on your water supply.