I'd do it and if you want more watta just connect other butts to the first one. Ours had a lid on it to prevent stuff falling in it and TBH the watter was never dirty. The tap not being right at the bottom helped with that.Currently filled oft half the garage roof. The uvva half has tree's leaning over it so there's more moss un leefs un muck. Me cassul roof issa bout 6 years old so still very clean.