installing RO unit should be easy just read instructions or if you do not have them, go read up online on how to install your RO unit,if your worried about how much water you need and how long it will take to filter you may get away with using 50% RO and 50% tap water, you could also buy a pressure pump for the RO unit to boost water pressure up to 8 bar so you can filter more water faster with less waste water too :jointsmile: