I have a simple pond filter I bought from Lowes for $69.00 I next added a water line 1/4 and an in line filter from lowes $11.00 and hooked it up to a drip addmitter from the garden sestion about $2.00 I the drilled a hole at the water line I wanted 3/8 ran it though the wall and I have never changed water again. It's been almost a year now my silver arrowna is about 15 inches long I have a large Oscar, large parrott fish 4 largeicliades, 2 clown loachs and I only clean the canaster filter once a month