Advanced Super-Compact Universal Shower Filter

Anyone know if these are disposable or can the actual filter itself be replaced?

I should read more.

Heads up:
Buying any number of these off woot is cheaper than buying 1 of this off woot and any number of replacement cartriges off the mothership.

Woot: 10 x $9.99 + $5 = $104.9
Prime: $9.99 + 9 x $14.99 = $144.90