The optimal system for Aquarium and Reef Tank owners will include a reverse osmosis system, with a final DI filter to remove any residual TDS. With water this clean, it is easy to maintain the correct balance for your tank, adding a preset amount of minerals, so the final product water will always be consistent. All our aquarium systems have refillable DI cartridges, so the quality clear cartridge should be reused time and time again. We offer customization on our systems, please call us with your specific needs. Premier Water Systems are the professional Aquarium Maintenance Services Providers in Los Angeles and around the LA Region. Visit our online store for buying all kind of filtration equipments, aquarium services and solutions.