If you're taken by the RO scam, you're low on something other than water pressure...

An industrial scale RO system is under 50% efficient. A home scale RO system with all the bells and whistles can just break 10%; some of them are under 6%. That means 90% of your water just gets dumped down the drain. Of course since you're using well water, your only concern is power usage (running the RO) and flow availability (the well does eventually run out if you overdraw).

Also, water molecules are bigger than i.e. Fluoride ions, so you can have fluoride in your output. Says some chemical engineering master's student, but I suspect he's wrong (my minimal high school chemistry credentials tell me that the electrical bonding between dissociated fluoride salt ions would prevent the fluoride ions from flowing through the RO membrane). Everything else comes out, for sure.

I just think RO wastes a lot of accessed water.