Organisers OATA Impact Exhibitions said it was always their plan to make AQUA a biennial event "once the show had established itself in the marketplace".
OATA added that with the bookings for stand space for this year's event were "already well ahead of the inaugural show in 2010".
AQUA 2013 will be held on 9-10 October and will now be staged in alternate years with Interzoo.
Show organiser Annie Dyke said: "The original rational was to go biennial once the show had become successfully established. The reasoning was quite simple.
"The major manufacturers felt that as the sector is quite small, holding the show every other year gives them the opportunity to develop and launch new products and keep AQUA fresh and relevant for the visiting buyers."
As for the interim years, all Dyke would reveal was "plans are under discussion".