I need about 50 ft. as I'll be running from my washroom to the fishroom in the basement.I'm going to keep the ro/di in the washroom to make using waste water for the washing machine easier.Also this unit has the drinking water ro tank and dispensor.I looked into www.usplastic.com not a bad price there.Just thought I would ask around before ordering and see what other reefers have done,or ordered from.