<span class="link_user">@Red_i_jedi</span>, No problem, it is "WATERING VOLUME PER PLANT PER 24H", so whatever you fill in there is per day. With what you just said that would give 0.5 l / 24h or 500ml / 24h
<span class="link_user">@TheBelgian</span>, Sorry, I am incorrect, I'm unsure what to put in that box as I feed them 1L every other day....usually.