Clearhead is an inline filter. It sits between the shower arm coming out of your wall and the shower head you already own. Nothing is cut and nothing is re-plumbed.
Fitting it
Unscrew your existing shower head. Wrap the exposed thread with the plumber's tape supplied. Thread Clearhead on by hand, then a quarter turn with a spanner. Thread your shower head back onto the other end and run the water for thirty seconds. That is the whole job, and it takes about two minutes.
What is inside
Two media, in series. KDF-55, a copper-zinc alloy, and calcium sulfite. Between them they reduce free chlorine, sediment and rust, and dissolved copper and iron picked up on the way through household pipework. There are no ceramic beads and no fifteen-stage claims.
Which cartridge
The standard cartridge suits supplies disinfected with free chlorine, which covers most of metro Adelaide. The chloramine cartridge suits chloraminated supplies, including Myponga, parts of the Adelaide Hills and a number of regional systems. If you are not certain which you are on, your water retailer publishes the disinfectant used in each supply zone.
Replacing the cartridge
Every 90 days, or roughly 90 showers. Twist the housing open, lift the spent cartridge out, drop the new one in and twist it shut. Under a minute, and no tools.
What it does not do
Clearhead does not soften water. It does not reduce hardness and it does not remove the dissolved minerals that leave scale on glass and tapware. A shower filter cannot do that, and anything sold to you on that promise is not a shower filter.