just a bit about the bubblers...
i have 5 big 70L tubs with good strong lids which i use as my bubblers for flowering plants in. these are the bubblers you can see in the attached pic. each of these bubblers has one dedicated line from the 6-way manifold on the 100L p/m compressor, which in turn is split into two air lines which feed 4 x 10" airstones. the effect is excellent, lots and lots of BUBBLES

on the front of these bubblers, at the bottom, is a hole with a green tube attached and a tap so i can remove water easily and also know where the water level actually is.
i have numerous lids which i can use for flowering, including 2 plant lids for if i want to grow few plants but bigger, or 8 plant lids (which im currently using) for SOG grows. as im in a country with liberal views towards cannabis, i feel ok growing larger plant numbers.
i also have, in the mother box, more bubblers, but these are smaller than the flower box ones at about 40L in size. these have 8 plant lids installed so i can keep a good number of mothers.
all my bubblers res's are changed every 2 weeks, and i maintain the pH of all of them every 2 days, as i like to let them drift a bit for better nutrient uptake.
to empty and fill them i have a 10 meter hose which i run to the bath and a good 1000L p/h pump so i just sit back and let the pump do all the work. this garden is the ultimate in LAZY !!

no more bad backs lifting bloody heavy soil plants
so far, ive got to say I LOVE BUBBLERS!!!!!!!!
everyone should try them, theyre just so piss easy to use.
edit: making those lids, was, i admit, a complete bastard of a job grrr... i couldnt find the right size round saw and the one i used was about 1cm too small, so i had to then make each hole bigger by angling the drill, it was a nightmare of a job... maybe i should have made more of an effort trying to find the right size round saw.