I have a filter set up on my porch so I filter the water prior to it entering the water tank. I just unscrew the filter canister and pour in the Stay-Pure and replace the filter in the canister. Once I turn on the hose the Stay Pure enters with the water. Prior to this set up I just poured it in the hose and then connected it to the Fresh Water Tank Inlet.
One thing I did find after filling the tank. I forgot to remove the strainer prior to the pump last fall when I blew out the lines with compressed air.
The screw on cap to the strainer cracked from freezing.
I took a Silver Sharpie and wrote myself a little reminder on the black panel just outside the pump compartment.
I won't forget that again!