Two membrane systems are under consideration for treating cooling tower blowdown to reduce its volume. A low-pressure seawater reverse osmosis(SWRO) system will operate at 500 psi and produce 720,000 gallons of permeate per day. It will have a fixed cost of $465 per day and an operatingcost of $485 per day. A higher pressure SWRO system operating at 800 psi will produce 950,000 gallons per day at an operating cost of $1280 perday. The fixed cost of the high pressure SWRO system will be only $328 per day because fewer membranes will be required. How many gallons of blowdown water must require treatment each day for the two systems to break even?

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Two membrane systems are under consideration for treating cooling tower blowdown to reduce its volume. A low-pressure seawater reverse osmosis
(SWRO) system will operate at 500 psi and produce 720,000 gallons of permeate per day. It will have a fixed cost of $465 per day and an operating
cost of $485 per day. A higher pressure SWRO system operating at 800 psi will produce 950,000 gallons per day at an operating cost of $1280 per
day. The fixed cost of the high pressure SWRO system will be only $328 per day because fewer membranes will be required. How many gallons of blowdown water must require treatment each day for the two systems to break even?

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