It is an omnipole that much I do know, but what gpd it produces I have not got a clue, although it has been used to fill up a 1000 litre tank and it has been running pretty much non stop and yes the filters will need replacing, he says they last about 6 months, which sounds pretty good considering the amount of water it must have been producing, he now uses more than 1000 litres a day (3 vans) so has got a newer system.