Ken Laidlaw wrote: snip > I think to get dGH from ppm you divide by 10, is this > correct? snip I asked about converting ppm to dGH on alt.aquaria a while back, and this is what I was told: PPM to *H is a 17:1 ratio, so 2 DH = 34 ppm, etc. HTH - -- Jesse Mathies Surrey, British Columbia Canada mailto:jessem@direct.ca