Springtech 300 RO, bought new and only used for maple syrup production at 1,000 tap operation. Typical use being 250-280 gallons/hour total throughput at 250-275 psi to take sap to 6%-8%. Never worked hard. Always put away and stored properly in heated area as needed. You will not find a used RO with the use and upkeep history that this unit has enjoyed, plus the Springtech's (and D&G, Airblo) units are the best built and most forgiving units out there. Must see to appreciate - www.mapletreefarmnh.com Reasonable offers will be considered, but not interested in endless conversations with low ball offers. You must come see it - www.mapletreefarmnh.com keywords: RO, Springtec, Spring tec tech, sugaring, maple syrup