Permutit Inhibitor replacement cartridge

I replace this each year,it seems to do its job ok

I could not remove the old cartridge, I had to remove the complete fitting and ended up drilling the old filter spigot out. These cartridges are prone to seizing up in the so called quick release system. I applied some silicon grease on the three O -rings on the new cartridge hoping next time the cartridge will easily come out from the fitting.

Does what it says on the tin and keeps scale manageable although I don't use this for drinking water. Not so easy to remove old cartridge at end-of-life - use a dab of water-grade silicon lubricant when installing.

Ordered on Sunday, delivered on Monday - but why can't I buy this over the counter ion my local B&Q warehouse where I purchased the original kit?

Too early to tell if it makes any difference to the water yet.
Easy to fit though and seems nice and solid.

The shower screen certainly seems easier to keep clean however.