Trudi Schifter invited me to join the Water Network and suggest that I post the message below. I would like the Members of the Water network know about a special offer that you will find interesting if you are an ultraviolet (UV) enthusiast. As some of you may know I have been marketing UVCalc software as a desktop product for many years. UVCalc calculates the fluence rate (irradiance) distribution in a UV reactor and, given the flow rate, can provide an estimate of the UV dose delivered. The market is quite limited, so my income from this product is minimal - I do it as essentially a service to the UV industry, where many users have found UVCalc useful in UV reactor design. I have now launched an UVCalc Online, where you can enter your parameters online and then receive an email with the output results. The special offer is FREE ACCESS FOR THE MONTH OF DECEMBER. After 1 January 2015, a fee system will begin to operate. If you are interested in this free offer, send me an email to jbolton@boltonuv.com, and I'll send you the access information.