I have the xp3 and I dont care to much for it honestly, it comes with no media, you will have to purchase the media yourself, if I remember right it comes with a zorb and pads, the cost of maintence to replace mine is about 50.00 each time ..... and the flow is not as good as I thought it would be,........ from what I have looked at to replace that filter / use it for back up, I would rather have gotten a pond filter plus its cheaper & bigger ... not sure what size tank you have, but its def not big enough for mine, I wish I would have went with my gut instinct instead of what the guy told me at tropical world of pets......
good luck