Some reverse osmosis units make 75 gallons of water a day, but some only make 12 or 16, yet the cost is about the same. Why would anyone buy the low producing RO unit?

More isn t always better. If you need 75 gallons a day, then you should buy the bigger unit. But if you re only going to use 3 gallons per day, a lower production membrane will probably last longer and do a better job because it gets to run longer and spends less time sitting idle.

Reverse osmosis membranes clean themselves as they process water, so it s really healthier if the membrane has to work longer to fill the tank. Think of it this way: If you draw off a gallon of water, a 24-gallon-per-day membrane will refill the tank at the rate of about a gallon per hour. For most users, that s plenty fast.

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