I saw that I can use a SodaStream on Shabbos, but I have a specific question: Can I use a Sodastream on Shabbos if it has an LED indicator? If not, is there something I can do to it to make it usable on Shabbos? Would putting tape over the light perhaps help?
You can remove the battery and than there is no issue. here is the way to do it. US wont tell you but i found this on a Australia website
I was asked this very question by my daughter who also has a Soda Stream model with LED indicator lights. But the model I saw does not run on electric power, but the lights automatically are powered by the action of the soda canister which is fed into the machine that carbonates the water. So I thought you could argue that since my ultimate desire is to carbonate the water (permitted by such authorities as Rabbi Auerbach and the author of Shmirat Shabbat K'Hilchoso) that the automatic LED display which lights up is a "Davar She'eino Tzrichah Legufah"...in other words, is a secondary act which happens not because I want it to happen but which is a result of my primary act which I do want to happen. Much like when you pass a house on Shabbat with security lights which will automatically go on once you go near and pass by the house, even though you do not wish them to go on, you could similarly argue here that the lights are not a necessary part of the desire for carbonated water, and therefore something which you cannot avoid,. and therefore could be permitted.
If you don't need the light then it's permissible, because it's a psik reisha d'lo nicha le