EZ4U is specifically developed for aquarists with small aquariums who want a simple answer to handling water changes. This is particularly important now as more chemicals (some of which are toxic to fish and other aquatic animals), are being added to public water supplies. EZ4U is the latest in scientific technology for easily and quickly detoxifying tap water. EZ4U performs over a dozen essential tasks without the aquarist needing to cope with technical information, or needing more than one product.