(2869) Fri 10 Jul 92 15:44 Re: Re: Hydroponics > [text deleted] One comment on your first hydroponic post; pH is a little more confusing than what you wrote. Yes it is a measure of hydrogen ions, but the number are actually power numbers, ie pH 7 = 10 to the -7th number of hydrogen ions per liter. The larger the number, the fewer the hydrogen ions present, or the greater the number of hydroxy (-OH) ions present. Being powers of ten, the pH scale is like the Rickter scale, 7 is ten times as acidic as 8 which is ten times as acidic as 9. The inverse holds too. Like I said it gets complicated, but the more you know the easier it is to understand why things happen the way they do.