SodaStream on Shabbat

Any problems using SodaStream on Shabbat? Non electric pumping gas into a liquid from CO tank.

No problem

Some models have lights when gassing the water.

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I presume the models with lights are a problem on Shabbat.

What are the lights for? Please be specific.

Some models, when you charge them with the gas, have a light go on to show the level of carbonation, so one decides if he or she wishes to charge the container again, at which point another light will appear.

Yes that could be a problem as the light serves a purpose in the making of the soda.