Strange things in my water bottle!

[Ripstop]

I was just topping up my coolant after having a water pump change (another story) and found these floating in my water bottle. They look genuine but I have no idea what they are. They appear to have some crystals in them so I can only imagine they are some sort of water softener. But that just sounds ridiculous 

Any ideas?

[Prewy]

They look like Polyphosthate filters to me, used for de ironing water (De_ionized). In turn eliminates lime scale and other contaminants.
My guess anyway, until somebody else agrees or disagrees!

[Degudodger]

Agree 

[MPS]

Makes sense, keep them in to help keep your jets clear.

[Ripstop]

So the next question is why 2 and should I buy new ones? Yes paranoia for a 9 year old car 

I am thinking its precautionary and that's why you can add straight tap water. I will pop them back in.

[slix]

So the next question is why 2 and should I buy new ones? Yes paranoia for a 9 year old car 

I am thinking its precautionary and that's why you can add straight tap water. I will pop them back in.

They might be pretty shot by now anyway.  Could get more or just use deionised water as dirt cheap.

[Flyingscotsman]

The VW G13 oem coolant comes in a ready diluted form, so doesn't need mixing. If using another coolant I would recommend using de-ionised water if you are diluting it.