Is there anyone, who has BWT Initium 2.5 l filter and can explain me, what is going on with their scale?

​When I fill it with water and wait until it filters out to exactly 1000 ml​ mark​ and then pour this water to another vessel with scale, it turns out, that I actually have 700-800 ml. ​By analogy, ​when I filter exactly 1500 ml on BWT Initium scale and pour that water out, I can get 1,2 liter at most.

Is there anyone, who could explain me this magic?

​I've been using many filters before BWT Initium and when filter scale showed 1500 ml, I could pour 1,5 liter kettle to the top. This is my first product, that has so strange scale.​

  • Have you tried weighing the water? 1l = 1kg Apr 29, 2015 at 10:24
  • I'm not sure, if weighting the water would change anything. Scale is in mililitres, only it is incorrect. It has nothing to do with kilograms or water density. This is just a filtering pot, not a scientific device! :>
    – trejder
    Apr 30, 2015 at 6:04

1 Answer 1


Reply just received from pot's producer. In case someone would be interested about "the magic":

The scale with 2,5l just applies to the empty jug without funnel and cartridge. So the funnel with cartridge inside displaces the water in the jug. I just tried this out with my own Initium jug.

If you fill in 1000ml it´s the same amount of water, but it will be e little bit more at the scale.

I know, this is a little bit confusing, because the measurement can be read as the amount of filtered water. I´m very sorry for that. But I guess this explains the “magic” in this case.

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