I never really noticed that, but I'd imagine that this is true. IME the time to build up pressure was minimal so much that I really didn't even factor it in. For my needs as long as the contents of the bottle were distributed to the tank by the end of the week I was happy. I use EI method of dosing and I don't buy into the whole mentallity that everything has to be so precise. This doser is probably not going to dose a constant rate. Does it matter? Not to my plants.
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