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The hard part for someone trying to do it in a bathtub would probably be making sure it picks up the dna you’re wanting and not something else randomly from the environment
That’s why you introduce the marker (like resistance to a common antibiotic ) in the same strand, then put antibiotic in the bathtub to kill the rest. Of course its a good idea to wash the tank first…
Instructions unclear. My wife is now asking why the bathtub is full of syrup. Please send help.