With the shortage of untreated softer water this winter I've decided to get an RO system. I think I can have it supply our drinking water, aquarium freshening and of course the orchids. I use to use aquarium water this time of year but that was because I filled the tank with purchased distilled water. Since I started using tap I've been noticing a heavy mineral buildup. Bad enough that there are deposits at the base of most pseudo bulbs of potted plants. I use melted snow for the more sensitive but that supply is not very reliable anymore and can only be collected from a fresh fall.

I see 6 stage systems for sale that state the water produced would have a PH level between 7.3 and 9. To me that sounds a bit high. Would a 5 stage system have a lower PH?

Is there any real difference between 5 and 6 stage?

I live about 1 mile from one of the largest freshwater lakes in the world but our water bill is just stupid. What kind of lost water % can I expect?

I probably have other questions but I'm hoping the manufacturers/sellers will get back to me after the holidays and with answers without handing me a bunch of crap.

Any help or advice much appreciated!!