Alright, so I need to leach my plants, and it seems simple enough but I'm not exactly sure I get it. When I looked it up I found this several times... "To leach soil, over water the growing medium until fluid can be seen above the soil line. Allow the swampy mess to soak for a few minutes, then pump/siphon off excess from the "well" at the lower end of the growing area." Does these mean lower end heightwise? as in there would be a puddle or something there? if that's correct, do i need to drain anything besides that extra puddle? will the water need to escape the pots through holes in the bottom? sorry for all of the questions, but thanks in advance!