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Old 09-09-2005, 01:13 AM   #11
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FWIW a good, properly functioning RO membrane should decrease the TDS by ten fold. For example, 300 TDS from the tap should be down to 30 TDS (or less) after the RO stage.
Good luck w/ the new membrane jackdp.
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Old 09-11-2005, 12:14 AM   #12
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Well, I've gotten my new membrane and installed. Tapwater was 475ppm, RO is now 40ppm, DI is 2ppm dropping. I'm going to let the system go for a couple of days and see if flushing won't hopefully lower some more.
On a side note, I just want to say how impressed I am with the service from airwaterice.com . They sent me new membrane right away, and even now while my TDS has dropped, they are still telling me it should be lower and may send a whole new unit. They even respond to e-mails Sat nights and Sundays..very impressed.
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Old 09-11-2005, 12:15 PM   #13
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Is the TDS meter calibrated? just a thought.. They sell calibration fluid for the meters or if you know someone that has one you can compare readings on the same water.
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Old 09-11-2005, 12:22 PM   #14
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I might calibrate it sometime. In the meantime, the more the system runs the lower the TDS is getting. I think I just had to get the membrane completely flushed and get all the previous "bad" water out of the tank and system. At last check TDS of RO was down to 32ppm and my DI water is now at 0ppm again. Hopefully switching from RO store bought water to DI water will help with my hair algae and cyano problem.
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Old 09-11-2005, 01:48 PM   #15
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Good to hear jackdp.
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Old 09-12-2005, 08:43 PM   #16
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Strange thing I notice. If my RO holding tank is empty, and I'm running water right through to the tap the TDS is around 30ppm. If the tank is full and and has been for a day or so, I get a TDS of up to 60ppm. Anybody else that uses a tank for drinking water ever have this? Perplexing....
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Old 09-12-2005, 09:17 PM   #17
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I don't use a tank but if its plastic it can raise the TDS from what I've read.
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