LiquaGen's 5 stage 150 GPD RO/DI unit is an excellent option for first time reefers who are on a relatively clean city water supply with low chlorine levels. The 5 stage unit is designed primarily for reefers but can be used for fresh water or salt water aquairum enthusiasts and a wide array of applications where ultra pure zero tds is needed. The 5 Stage unit is built on one frame making it portable and does not require permeant installation, modification, or drilling. Installation of this unit should not take more than 5 minutes!