About a month ago I bought two Paphs (Maudiae type). I keep reading that they are very sensitive to water quality, so I've been trying to figure out whether my tap water is ok for them. I know that we have hard water and it's alkaline. The city report says it has 40 ppm sodium.

Will my Paphs do well using this tap water for everyday watering & fertilizing with a once-a-month flushing of rain water? If not, what should I do?

I will appreciate your advice! Dana