Jazz Carlin and Fran Halsall missed out on automatic Olympic qualification despite winning their finals at the British trials in Glasgow.
Carlin won the 800m freestyle and Halsall the 50m freestyle but failed to meet the qualification times and must seek Rio 2016 places in other events.
“It’s just not good enough,” Halsall told BBC Sport.
Max Litchfield, 21, won the 400m individual medley to become only the fourth GB swimmer this week to qualify.
He beat favourite Roberto Pavoni, who had won the past five British 400m individual medley titles.
Litchfield knocked more than five seconds off his personal best during the third day of the trials to triumph in four minutes 12.05 seconds, three hundredths of a second inside the qualifying time.
“I have dreamt of this moment my whole life,” he told BBC Sport.
“It’s a boyhood dream and I knew I had it in me, but for it to become a reality is a bit surreal really.”
Carlin finished in eight minutes, 27.49 seconds – she required 8:22.93 to qualify – while fellow Commonwealth champion Halsall won in 24.48, just 0.09 secs outside the time required.
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