The Edge - Q4, 2015 - (Page 23)

Technical Feature Questions Answered UV, Heat Pumps, Salt Chlorine Generators & Ugly Plaster Discoloration EDITOR'S NOTE: Of the 80 sessions that will be offered at The Pool & Spa Show, January 25-28, 2016, in Atlantic City, some of the most sought-after sessions to attend are the technical programs. We asked several of our experts who will speak at those sessions to give us a heads-up on the most common question they are asked about their areas of expertise. Dan Tillman, Delta UV, on UV systems Can I run a pool on a UVC unit alone or with no chlorine? The answer is no. UVC is a secondary sanitizer, so it needs to be used in conjunction with a halogen-based pool sanitizer. The good news is the pool owner will use half of the sanitizer and algaecide as they would vs. a pool with only chemical sanitization. A UVC system does two things really well: first, it will sterilize any single-cell organism growing in the water; and second, it will photo-oxidize any chloramines in the water. Any form of chlorine or bromine is great with a UVC system, along with any type of super chlorination and algaecide, again using half the daily chlorination, half of the shock and half of the algaecide. UVC also works very well with any mineral ionizer, filter media, enzyme and variable speed pumps. All of the sterilization and photo-oxidation happens in the line of sight of the UVC lamp inside the vessel of the unit. Remember please do not look directly at a lighted UVC lamp as it can damage the corneas of your eyes. Dan Tillman will conduct a session at The Pool & Spa Show titled: "UV Technology and Residential Installation." Get the latest information on all show seminars at www.ThePoolSpaShow.com. Sean Assam, AquaCal AutoPilot Inc., on salt-chlorine generators My system seems to be working properly, but I can't get a chlorine reading. What's causing this? There are several factors that can cause this. If there are no warning lights on the power supply, it usually means the salt system is working. However, there may be a damaged sensor that's not indicating error conditions. After verifying that the salt system is working properly, water chemistry and/or high chlorine demand conditions may be the most likely culprit. Water chemistry can affect the cell condition if the Saturation Index is not balanced. There's a good chance that the cell is getting calcium scale deposits on the blades, which will shorten cell life and reduce chlorine output. A monthly test of the Saturation Index should keep water chemistry conditions within proper levels. High chlorine consumption conditions include chemical additives, such as chlorine neutralizers (Sodium Thiosulfate) and specialty algaecides (Sodium Bromide); high phosphate levels and algae growth; insufficient cyanuric acid levels (for outdoor pools); and improper operating conditions (cell sizing, pump run times, etc). There could be other culprits. Sean Assam will be conducting two sessions at The Pool & Spa Show: an overview titled: "Salt Chlorine Generators: Just the Facts (in English)" and a more technical session titled "AutoPilot Salt Chlorine Generators: Operation, Installation and Troubleshooting." Get the latest information on all show seminars at www.ThePoolSpaShow.com. THE EDGE 23 http://www.ThePoolSpaShow.com http://www.ThePoolSpaShow.com

Table of Contents for the Digital Edition of The Edge - Q4, 2015

The President’s Message
NOW HIRING! How to Recruit the Best Frontline, Hourly Employees
Pool & Spa Company Owners Brace for Health Care Reform
Are You Good Busy or Bad Busy?
Project Focus: Aquatic Artists
A Pool for All Backyards: Hybrid Design
Technical Questions Answered
Index of Advertisers

The Edge - Q4, 2015

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