IntroductionThe Watts® OneFlow® Anti-Scale System provides protection fromscale formation on internal plumbing surfaces. The OneFlow® sys-tem can be installed at the point of entry to a building to treat bothhot and cold water, or it can be located directly before a waterheater, boiler, or other water using device that requires protectionfrom hard water.OneFlow ® prevents scale by transforming the normal dissolvedhardness minerals into undissolved crystal microparticles. Thesecrystals stay suspended in the water and have a greatly reducedability to react and attach to surfaces like dissolved hardnessdoes. Therefore the problem of internal buildup of scale in pipes,water heaters and on fixtures and glass is greatly reduced.OneFlow® is not a water softener or a chemical additive (like anti-scalants or sequestrants). It is a scale prevention device with proventhird party laboratory test data and years of successful residentialand commercial installations. OneFlow® is the one water treatmentdevice that effectively provides scale protection and is a great salt-freealternative to water softening (ion exchange) or scale sequesteringchemicals. Laundry and warewashing chemistry will likewise requireadjustments.OneFlow® Benefits• Chemical-free scale prevention and protection – convertshardness minerals to harmless, inactive microscopic crystalsmaking OneFlow® an effective alternative technology toa water softener for the prevention of scale due to waterhardness• Virtually maintenance free - no control valve• Uses environmentally friendly technology by using no saltor other chemicals to constantly add, no electricity andno wastewater• Improves efficiency of all water using appliances – both hot**and cold• Simple sizing & installation – all you need to know is pipesize and the peak flow rate• Safe for landscaping and lawn watering, no need for costlybypass plumbing• Compatible with all on-site and community wastewatertreatment systems• Perfect system for towns or communities where watersofteners are banned or restrictedInstallation, Operation and Maintenance ManualModel OF1260-30TM, OF1465-50TM andOF1665-75TM OneFlow® Anti-Scale SystemsChemical-Free, Salt-Free Scale PreventionIOM-OF1260TM_OF1465TM_OF1665TMWARNING!Read this Manual BEFORE using this equipment.Failure to read and follow all safety and use informationcan result in death, serious personal injury, propertydamage, or damage to the equipment.Keep this Manual for future reference.Do not use with water that is microbiologically unsafe or ofunknown quality without adequate disinfection before or afterthe system.WARNING!You are required to consult the local building and plumbing codesprior to installation. If the information in this manual is not consis-tent with local building or plumbing codes, the local codes shouldbe followed. Inquire with governing authorities for additionallocal requirements.WARNING!• For high-flow applications, install multiple tanks in parallel• OneFlow® does not remove minerals or add sodium to thewater supply• OneFlow can be installed as pre-treatment to commercialreverse osmosis systems (contact your Watts Representativefor further details)** For hot water applications where feed water temperature is100°F – 140°F (38° – 60°C), please consult ES-OneFlow-HotWater.The wetted surface of this product contacted by consumablewater contains less than 0.25% of lead by weight.Systems are tested and certified by WQAagainst NSF/ANSI/CAN Standard 61 andNSF/ANSI 372 for Lead Free compliance.Tank base may vary from image shown