General speaking, the normal aluminum soda siphon has only one year warranty because the very thin oxide layer might easiliy be corroded by acid or alcohol ( alcohol may speed up the corrosion ) . So, if you choose aluminum soda siphon then you have to be care not to put in acid or alcohol and have better not to keep the soda water in soda siphon over night to slow down the oxide layer's corrosion. Though you mightl lost much fun in making varity of soft drinks, but that's the only way to prevent you never know when you will start to drink the aluminum element directly.
Stainless steel ( food grade ) is not only much stronger than aluminum, but also acid and alcohol free and more important of the sanitation concern.
1 liter Stainless steel soda siphon - Family size
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