So what is finel cost, Sodastream is $15 each canister

I have never seen Soda Stream at $15 per cannister. Cheapest Soda Stream on Amazon is $64.99 for 2 which makes them $32.49 each. I have no idea where you are seeing that. I paid $54.93 for 2 cannisters from Simpli Soda.

how does the exchange program works? I mean how to return the cylinder?

I looked at their website and saw that they have options to return cannisters. They send you pre-paid shipping packages to return your empty ones and purchase new ones.

ASIN	B0C2LJ9VGH
Brand	Simpli Soda
Brand Name	Simpli Soda
Capacity	60 litres
Colour	Clear
Customer Reviews	4.5 out of 5 stars 1,054 Reviews
Item Volume	60 Litres
Material	Aluminium
Material Type	Aluminium
Operation Mode	Manual
Power Source	manual
Power Source Type	manual
UPC	196852680436

60L CO2 Cylinders, Threaded Style Exchange Carbonator Refill, Compatible With Sodastream (NOT SODASTREAM TERRA & ART MACHINES), Set of 2

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