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Old 09-23-2005, 04:08 PM   #1
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What is a good ppm for TDS if your useing a ro filter?
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Old 09-23-2005, 04:08 PM   #2
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RO filter only? I would say less than 15ppm. If your doing RO/DI than less than 5ppm.
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Old 09-23-2005, 04:38 PM   #3
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It depends on the TDS of the water source. A properly functioning RO unit should decrease TDS by ten fold (or more). For example if your tap water has a TDS of 300, after the RO it should be 30 or less. A DI will take care of the rest and bring it to 0 TDS.
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Old 09-23-2005, 04:42 PM   #4
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Ahh ok. My tap water is a littl over 300 ppm and with the ro it is 21ppm. I called the company that made my ro filter and they said since it was less then a week old that the
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MAG-DRIVE 700 GPH
2x Maxi-Jet 1200 Power Head
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Old 09-23-2005, 04:44 PM   #5
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21 will drop some more. I was just worried becuase I thought it should be real close to 0ppm..
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Old 09-23-2005, 04:53 PM   #6
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FWIW I just replaced my RO membrane (Kent TFC) and my tap is about 290, after the RO it was at 12. 21 TDS is acceptable for just RO, you can add a DI on fairly cheaply and very easily to get it down to ~0.
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Old 09-23-2005, 05:39 PM   #7
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IMO there is no way you are going to get 0 from just a ro unit with a start TDS of 300.
Do you mean ro/di unit? Now that should get you 0 or **** close to it.
And even if you have a low TDS that does not mean you will not have issues with your water, some things are not picked up with a TDS meter. And is the TDS good or bad TDS ? No way to tell.
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