Use of Rain water and waste water for watering garden London (UK).  ($10)
I intend to use two large butts to hold water from the roof and waste
water from a bath room.  Need succint advice on the practicalities,
including health regs which apply, keeping butts sweet and a suitable
external pump for use with a hose.  I don't want a submerged pump
because it is hard to service, I don't want advice on submerged tanks
or complex valve systems for using waste water from the house.  I
don't want advice on drip irrigation etc. Just simple practical advice
from someone who has done it successfully for a couple of years or so.