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08/20/2008, 08:30 PM
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#1 |
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Registered Member
Join Date: Mar 2008
Location: North Alabama
Posts: 79
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ro/di water?
i have recently purchased a used rodi unit . My question is i have always used the prime drops in tap water before the rodi water, do i still need to use the drops? my rodi is measuring 22-25.
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08/20/2008, 08:53 PM
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#2 |
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Moved On
Join Date: May 2008
Location: Phenix City Alabama
Posts: 739
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No drops needed. If your RO/DI unit is reading 22-25 ppm after the DI, its time for new membranes and DI resin.
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08/20/2008, 09:48 PM
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#3 |
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Registered Member
Join Date: Mar 2008
Location: North Alabama
Posts: 79
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that is with new membranes and a new di tube. it was close to 400 before. i bought the unit used and didn't think to ask her how long it had been since changed.
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08/20/2008, 10:43 PM
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#4 |
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Moved On
Join Date: Jun 2007
Location: Laguna Niguel, CA
Posts: 7,497
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You might want to look into a better membrane. It should be able to pull it down to 0. Does this unit use prefilters?
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08/21/2008, 06:10 AM
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#5 |
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Reef Chemist
 
Join Date: Apr 2001
Location: Arlington, Massachusetts
Posts: 86,233
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A properly functioning RO/DI should read 0 ppm TDS in the effluent. If not, then something is likely wrong, or it is very poorly designed. Even DI alone should give 0 ppm TDS until it is depleted.
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Randy Holmes-Farley Current Tank Info: 120 mixed reef |
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