i see many people leaving links to hydro store websites with fancy systems etc, can we not just goto a general garden store and use watering systems such as this one here -> http://www.garden4less.co.uk/water-butt-pump.asp i would put nutrients in water etc and just leave it be on a timer?i would have 45 plants so it would need some add ons etc but this would be ok? also would i need to create some kind of drain off system or would the plant pots be fine as is?