Limetron Inline Water Conditioner / Hardwater Limescale remover 1/2'' (15mm) - Water Treatment Guaranteed green technology for hard water scale prevention. Scaling caused by hard water can be a major problem but it can be prevented without needing to use chemicals or water softeners that can be hazardous and cause pollution. Scaling can block nozzles, coat pipework, clog up boilers and heat exchangers and cause substantially increased energy use.