how much air is enough???

Can anyone tell me how many 5 gallon buckets can a 200w/190 lpm commercial air pump can supply a sufficient amount of air to???

I have my 70L/min supplying 4, 5gal buckets (2 stones each), looks like the water is boiling.

So I'd say a dozen, easily. Just remember to have a back up system.

Good luck.