Questions about Lelit Filter 70L

Apparently BWT Bestcup has a solution with a standard adapter that should fit the Lelit. The standard Lelit filter is too expensive for me, but I haven't tried an alternative yet. That's why this is only "research" and not "tried out". As far as I have seen, there are also refillable filter cartridges where you can replace the granulate yourself. That would be almost the most attractive option for me, but I haven't seen a suitable filter cartridge yet - except for the brand Eigenbau.

Nein, Sage hat eigene Filter: Sage Claro Swiss (1 Stk.)

35 l and 70 l fit our PL60T. They are both exactly the same for attaching to the water hose and in diameter. The only difference is that the 70l is about twice as long... I.e. the tank should simply be deep enough, then it fits!

That would be the idea. The water becomes softer and limescale no longer forms in the machine. You shouldn't rinse a portafilter with descaling agent anyway (it depends on the type: certainly with a dual boiler like the Lelit Bianca). Instead, you should disassemble the machine, replace the seals and descale the boiler directly. If you use a filter like this, you will only need a major service like this after a few years, when the seals start to leak...