Wales women's 4x100 freestyle relay team set a new national record to help the hosts lead the Celtic Tri-Nations Championships on day two in Swansea.
Chloe Tutton, Jemma Lowe, Danielle Stirrat and Siwan Thomas-Howells struck gold in an impressive performance.
Sara Lougher won the women's 100m breaststroke gold before team-mates Sian Harkin and Tilly Gray secured a women's 50m butterfly Welsh one-two.
Welsh Olympian Tom Haffield also won gold in the 400m individual medley.
Wales ended day two of the championships on 17,040 points, leading Scotland on 16,799 points and third-placed Ireland on 16,707.
Olympic star and Commonwealth bronze medallist Lowe had kick-started Wales' title bid as she warmed up for the World Championships in July by winning the women's 200m butterfly on Friday.