INTRODUCING THE AQUA RINSE PLUS Posted January 7, 2013 Thetford Aqua Rinse Plus combines high standard performance with ultimate freshness. It enables a more effective flush and keeps the flush water clean. At the same time, Aqua Rinse Plus leaves a hygienic protective layer in the toilet bowl and prevents scaling. Flush water in portable and cassette toilets will not only be kept clean but will also smell nice, as the Aqua Rinse Plus leaves a pleasant lavender fragrance.