The Phillies optioned Falter to Triple-A Lehigh Valley on Tuesday.
Something had to give with Falter, who fell to 0-7 on the year Monday against the Giants. The 26-year-old left-hander heads to the minors with an overall 5.13 ERA and 1.44 WHIP through 40.1 innings (seven starts, one relief appearance) this season with the reigning NL champs.