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Has anyone tried using these stainless steel DIY "CO2 Generator Systems" being sold online? Basically works like the DIY Citric Acid+Baking Soda in two bottles but instead inside a single steel cylinder with a regulator.
Example:
https://www.alibaba.com/product-detail/WUYOU-D601-Stainless-Steel-Aquarium-CO2_1600152598137.html
Example:
https://www.alibaba.com/product-detail/WUYOU-D601-Stainless-Steel-Aquarium-CO2_1600152598137.html