I used to hang a pitcher on the side of the tank with both hoses in it,turn the filter up side down, turn it back up rite,then the water would flow,then I would add the powder to the pitcher, then I would remove the pitcher from the tank leaving the hoses inside the tank,it was a pain but the results wear amazing! I have gone through three diatom filters,my first two lasted a long time in fresh water tanks but the third only lasted about a year with salt water flowing through it. The salt water realy does a number on the motor and more importantly the o rings inside the pump housing , when the o rings go bad that's when it gets hard to prime,leaks water,and creates microbubbles, and ticks you off! Lol. With all that said I still miss my diatom filter and would buy another.