Reservoir is outside because of space limitations . I am using a 12V bilge pump to deliver the water inside. For a float I am using one that is used on boats for a bilge pump. Because I need reverse action of the float to pump in and not out I have turned the float upside down and drilled holes into the plastic to allow water into the float chamber being careful not to damage float. Main advantage I am using 12V DC system and not 115 V AC and parts are easy to find.
NOTE:
I did have one problem of siphoning when pump turned off which wasn't a good thing as reservoir could be emptied .
My easy fix was to drill a small hole in hose above water line at pump end which killed the siphon action when pump stopped.
