What's in a hydro?

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The key word is"commerce". Commerce involves an exchange of goods or services for monatary compensation. Do you pay yourself to fill your own tanks or to transport them in your vehicle. If not then you are no involved in commerce. Even state laws apply to "in commerce".
I agree strongly, but remember that when FDR decided to limit what farmers could produce the SC decided that even grain that was produced and eaten on the same farm was involved in interstate commerce.
 
https://www.shearwater.com/products/swift/

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