The MacLean CS Series water conditioners, from CUNO Water Treatment, are equipped to clean and condition water and require less than 30 gallons of water to regenerate. Meter-initiated models can save both salt and water. After the water has been conditioned, the filtered water can protect plumbing by reducing scale build-up. The MacLean CS models have grain capacities ranging from 34,000 to 68,000. CUNO Water Treatment