Mike, this applies to use of the water softener pillow, but not to the tap water purifier, correct? I don't know how the TWP works at all (excuse my ignorance), but while I recall the resins can be recharged on the TWP, sodium was not part of the recharging solution. Sylvia > Remember that using a sodium ion exchange resin will soften the water but > will > increase the electrical conductivity of the water. More and more aquarists > are > finding that a low E.C. appears to be more important in successfully > breeding > softwater fish than hardness alone. By softening your water with pillows you > have > probably lowered the hardness but doubled your conductivity. ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!