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Old 11-30-2004, 01:28 PM   #1
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TDS?

First of all I'd like to say it is nice to be back. I went on vacation to israel last week for thanksgiving (lol & pics are in the lounge). Before that I was out for the weekend so it has been a long time since I was last here. (wow that was a long introduction)

What is with TDS? The water out of the tap measures 202-250ppm. The water from my five stage RO unit measures 120-163. Nitrates are miniscule <2, chlorine is at 0, phosphate is at 0, However 120-163 seems really high. What's the deal? Does an RO unit not get rid of ionized substances?
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Old 11-30-2004, 01:38 PM   #2
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That is VERY high, I think your meter is off. My inlet (from well water) is 85-95 and my outlet is 0-1.
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Old 11-30-2004, 02:07 PM   #3
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How do I calibrate it?
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Old 11-30-2004, 02:24 PM   #4
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200-300 is not abnormal for source water. 20-30 is not abnormal for RO output. 160 is too high. something is wrong.

to get 0-3, you generally need a DI after the RO. Bearfan either has a broken tds meter or a very clean well.
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Old 11-30-2004, 02:49 PM   #5
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How do you explain the readings for nitrates, and phosphates?
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Old 11-30-2004, 03:00 PM   #6
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Quote:
Originally Posted by jaiden
to get 0-3, you generally need a DI after the RO. Bearfan either has a broken tds meter or a very clean well.
Lake Superior water through a sand substrate. About as clean as a well can get.

And I do have a DI.
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Old 11-30-2004, 03:01 PM   #7
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I'd guess that the nitrates are being read by the tds meter. DI would help you, but putting 160 tds into a di will use up your DI resin in a hurry.
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Old 11-30-2004, 03:04 PM   #8
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You say RO so you have no DI cartridge right?
How old are your filters on the unit. Whats the GPD on your membrane. You can buy calibration fluid for a TDS meter on line.
If you have a DI then I would say its used up. What type of unit and what filters do you have. I have a Micron then 2 carbons then the membrane then 2 DI units. I get 0 TDS... Starting out with 280 TDS with 40 after the membrane.
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Old 11-30-2004, 03:09 PM   #9
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No DI, just a 5 micron charcoal then another 5 micron charcoal, then one sediment, and two other sediments I think. It's a 75 GPD membrane. It is brand new just two weeks old.
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Old 11-30-2004, 03:11 PM   #10
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can you send me some of your water to calibrate it seaham. send me a PM.
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