R. Chayyim Falagi on Piping Water into a Mikveh (13 Adar Sheni)

שו"ת חיים ביד מ"ט 13 Adar Sheni 5727 (1967)

R. Chayyim Falagi corresponds with another rabbi about piping water into a mikveh-- when do pipes make the water she'uvim, and unusable? What situations let us accept less than ideal standards for building a mikvah? Can a river be a mikveh?