Bev;
I use well water. I had most of the usual tests done, but not for nitrate or phosphate. They were a couple hundred dollars.
I have and still do at times, use straight well water for my tank, after running through a large main line filter. I also use ro water. The ro unit also feeds my upstairs fridge ice/water maker and a spigot at the sink.
However your correct on hard, cold well water being hard on ro membranes. Actually a better job for a unit like the Kold Sterile unit. The secret is to pass the well water through the water sofener first. This makes it much more easy for the ro unit to handle not to mention the ro removing the softening salts before it goes to the fridge and sink.
So, my water first goes through a main line 30m filter, then the softener, then a 5-stage Vectapure ro unit.
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Doug
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