11-21-2005, 07:01 PM
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Member
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Join Date: May 2004
Location: Regina
Posts: 905
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my mistake..it's 70F
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The advertised GPD values assume ideal conditions, notably optimum water pressure (65 PSI) and temperature (70°F). The purity of your tap water also affects it. In other words, your mileage will vary.
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however:
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Do I care about temperature?
The GPD ratings are for room temperature (~70 ° F). Colder water travels more slowly through the membrane, which reduces the output. If a high-GPD unit is connected to a cold water line, that can be a problem. Here's a solution from Marc Levenson:
You want approximately 25' or 30' feet of tubing from the connection at the cold water running to the RO/DI unit.
Fill a 5-gallon bucket with water, and coil the excess tubing in the bucket so it is submerged. Immerse a small aquarium heater set it to 78 degrees F. As the RO/DI unit kicks on, water in the tubing will be warmed up to 78 as well, since it processes rather slowly, and the membrane will be able to produce maximum output in the dead of winter.
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