50 gal a day isn't much. Home use I rock at the bare minimum of 1200gpd with a booster pump. The 50 will get you less the. 2 gallon an hour due to pressure and water temperature. At peak performance it'll get 2 gals but not anymore. The 50 you could leave going all night and sadly it would never fill a 50 gallon tank in a day. I would guess maybe 25 gal....maybe.