Just FYI - RO is pretty good but far from perfect... some drawbacks:
RO systems use about 8-9 gallons of water for every gallon of filtered water. This is called the "reclamation rate", which is usually 10-20%. Check the system before you buy, esp. if you live in an area where water is expensive (like southern CA).
RO filters out most solids, but does not catch bacteria, parasites or suspended oils, which can easily pass through the RO membrane. For instance, desalination systems on boats that purify seawater for drinking often have a separate oil filter and a UV chamber that exposes the water to light that kills bugs. This is especially a concern with folks who have unchlorinated well water, since the water is usually stored in a tank post-filter where bugs can grow.
Systems decline in effectiveness as their membranes get older. When you start out with a tds of 5 it could rapidly increase as the filter begins to fail. The only way to know is to test water periodically.
RO systems can also be expensive to maintain. A heavy hydro user might have to replace filters 2-3 times per year or more based on the quantity of water put through it. Most systems are designed around a filtering water for drinking at a spigot on your sink. Replacing the filters in a standard home system adds up fast - $50/each for the RO filter itself, then another $40 for the carbon blocker (if your system has one). |