From: Felix[SMTP:73374.1547-at-compuserve-dot-com] Sent: Sunday, September 07, 1997 12:24 PM To: BlindCopyReceiver:;;;-at-compuserve-dot-com; Subject: Re: Water rheostat? Chlorine! Good point, one should think about what ions one wants to have in solution---carbonates are more benign. Thanks!