Everyone in your family, including those with asthma and allergies, will appreciate the Rainbow® Cleaning System. Independent laboratory testing has scientifically proven: The Rainbow removes a significant amount of allergen from carpeting. The allergen that is removed cannot escape. It stays in the water basin. The Rainbow does not experience a reduction in allergen pick-up in a partially filled water basin. The Rainbow user is not excessively exposed to allergen while emptying the water basin.