Records don't stand a chance in the pool that will be the site for the next Olympics.

South Africa's Penny Heyns and American Lenny Krayzelburg were the latest to send world marks toppling today at the Pan Pacific swim championships.

Heyns broke her eighth breaststroke world record and Krayzelburg set his third backstroke mark of the meet in 50-meter time trials organized around the main program. So far, 12 records have been broken--at least one in seven straight days--in the pool that will be used for the 2000 Summer Games.

Heyns set up a 50 time trial during the morning heats and Krayzelburg did the same in tackling the 50 backstroke at the end of the finals session.

Heyns's time of 30.83 seconds beat her 30.95 set in the Goodwill Games in New York last August. Krayzelburg's 24.99 beat the 25.13 set by fellow American Jeff Rouse before the event was given world record status two years ago by FINA, swimming's governing body.

South Africa's Brendon Dedekind won the 50 freestyle to claim the country's first gold by a male swimmer at the Pan Pacific. Michael Klim of Australia, the 100 butterfly world record holder, won the event for his fourth gold of the meet.

American Brooke Bennett, a gold medalist at the 1996 Olympics, won the 800 freestyle in a personal best 8:25.06. Japan's Tomoko Hagiwara won the 200 backstroke.