I have an old book that advises to mix chemicals for PH adjustment use a percentage, such as 7% or 5% or 40%, when mixing dry chemicals with water. The book does not say how to do this and I am, as usual, clueless. Any aid? Thank you, Barrie Smith, Missoula, Montana --------------- See http://www.aka.org/AKA/subkillietalk.html to unsubscribe