it has two 4" bottom drains and runs too two four bay filters with vortexs, and is pumped back to the pond with a sequence quarter horse power, and seperates too two 55w uv,s ,one inlet returns to the pond mid way ,and one returns into the rear veggie filter,it also has a skimmer,and airratted bottom drain covers,powered by a 100 litre air pump and a 80 litre air pump feeds the filters ,the pond is 8000 gallons,and the filters including the veggie filter are roughly a 1000 gallons. i have also built a quarnteen room witch has a 200 gallon pond which is filtered by a 2" bottom drain and runs though a pressureised filter ,
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