Get a 5-stage RO system without a tank. Tanked systems are only a good idea if you use enough water that the tank doesn't sit stagnant and you include UV, othe

Get a 5-stage RO system without a tank. Tanked systems are only a good idea if you use enough water that the tank doesn't sit stagnant and you include UV, otherwise tanks can be a place that causes bacterial growth. The reason you want a system with more stages is that you can have multiple pre-filters before the RO membrane which allows the membrane to last longer and allows cheaper filters to be the most often replaced.