help please new dwc constant current setup

I got a couple of lemon bubba kush clones ready to go into pots and i want to put them into a 5-5gal bucket system with four plants and one bucket for control so it will be like 15-18 gallons in the system total at any given time and I am wondering, what strength of water pump and air pump (lph/gph?) will I need to operate this system effectively? Some kind of "rule of thumb" to go by or some links to ebay or amazon would be awesome.

I have a 4pot system and i use a 750L/hr water pump. As for the bubble i use 2x 1100 Aqua One air pumps. Hope this helps.

Minimum Air Requirement
1Lpm/gallon

Minimum Water flow Requirement
gallons in system x10= Minimum water pump size

Dude, there is only 1 way to make sure everything in your buckets are circulating correctly, without having to use a heavy water pump to blast the temperature in your water. Get one medium size pump, like 200-300 gph. Hook all your buckets up so that each one is connected to your main reservoir, and each other. Have the pump hooked up to a manifold, with tubes top feeding each bucket, so that each plant is being fed directly from your reservoir.