I use three Rio 3100 pumps in my green house and one Beckett G535AG Pump in my greenhouse. The Rio pomps pump 900 gal per hour and the Beckett pumps 535 gal per hour. So every hour the total valium of water in my tank is either gose through the filters, grow beds or through the fountain head.
Cleck here to see the Beckett pump
Cleck here to see the Rio pump