Has anyone tried this 3rd-party Quooker scale control cartridge replacement?

itm2

The scale control plus on our Quooker 3XCHR is beeping again to indicate that we need to replace the cartridge (at a cost of £80). The last one has been installed about 15 months.
At this rate, the Quooker scale control is costing us around £5 per month.

A quick Google search unearthed this alternative:
https://www.uk-water-filters.co.uk/products/quooker-scale-control-plus-alternative?gad=1&gclid=CjwKCAjwseSoBhBXEiwA9iZtxoU2rAezWPCUdES0eeQpI11IPGPwkS_vFzdAZrzVmaJ05oZCO5Z97BoCU2YQAvD_BwE#product_tabs_description_contents_tab

It says that it will last 6 months (whereas the Quooker lasts 15 months from experience). I was wondering whether anyone had tried one of these, or alternatively can recommend a decent lower-priced alternative to the Quooker cartridge?

(I've looked at a video showing how to descale a Quooker manually and it doesn't look like something that I'd be comfortable doing every year).