Flat_Eric I live in a very soft water area & tried the BWT Jug using the Magnesium cartridges with a view to increasing the mineral content of my water. After 3-weeks I stopped using it as it’s the only time I’ve had the vac-relief valve on my machine stop closing properly & I had to clean it. It was coated with a fine white residue, though it did just wipe off.
I’ve also used the Brita filters (The cartridges are interchangeable with the BWT) & I still do for drinking water as they remove the chlorine they like to add in abundance here. Though I have found they also reduce the pH of the water a little
I’ve started using a Zero jug for my coffee & mineralising it myself, which is now my preferred method.
To put the softness of my tap water into perspective. I started using the Zero jug at the beginning of December & 3+ months later I’m still on the same filter with the TDS on the supplied meter still reading 000. (It’s not broken I’ve checked 😉)
I did read a tip somewhere about extending the life of your Zero cartridge if you also have a Brita jug by running your tap water through the ‘relatively’ less expensive Brita filter first before running it through the Zero jug so you’re putting less rubbish through the Zero filter