Here is the Ebay Store
that I got my RODI
from back in 2006. It is still going strong all I have had to do was replace filters as needed.
The 3 prefilters are there basically to remove large particulates from your source water. I use a carbon filter, sediment filter and a coconut husk carbon filter as my 3. The real magic happens when the water gets to the RO
membrane where the water is truely reduced down to pure H20. If you have DI
on the system great if not you will survive without it. I have a 6 stage filter with a backflush allowing me to push water back over the RO
membrane keeping it clear.