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Old 04-14-2011, 12:13 PM   #1
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Testing Ro/di water

So I got a good 5 gallons already purged from my new ro unit and I wanna test it to make sure it's good. I was going to do the following tests: ammonia, nitrite, nitrate and phosphates. I should have but don't have a TDS meter.

Will these tests be enough or is there anything else i should test for?

Thanks guys!
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Old 04-14-2011, 12:43 PM   #2
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Better tests would be GH, KH & pH. If the RO is working, GH & KH should be near zero. <If you have a TDS - then 0 TDS would indicate 0 KH & GH.>

pH should be near 7.0 or a bit below.
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Old 04-14-2011, 12:45 PM   #3
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I'll go check the ph and gh/kh. Never tested for gh or kh but we'll see how i do.

thanks!
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Old 04-14-2011, 12:49 PM   #4
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The LFS should have a TDS meter, you could take a sample there.

IMO there is no point in having an RO/DI sytem if you can't make sure it is working properly with a TDS meter and know when to change the cartridges. I got mine for $10 shipped on eBay.

You may have to run a lot more than 5 gallons before you get the system producing 0 TDS.
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Old 04-14-2011, 01:02 PM   #5
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I've already been looking on ebay. I'll probably pick one up ral soon.
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Old 04-15-2011, 11:44 AM   #6
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Best to get a TDS meter, I bought one and checked my well water, just to see what it was and it was 176 I then checked the RO water I was getting form LFS thinking I would see 0 well guess what, It's was 336! I then checked some distilled water and that was 0 > I cound't believe it. I bought a RO/DI unit on ebay that same day and just recieve it yesterday. So I would not have know if not for the meter. Also going back to LFS today to see whats been going on, I been using that water since I started my tank I would have been better of using my well water.
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Old 04-15-2011, 11:46 AM   #7
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Quote:
Originally Posted by frankieg2 View Post
Best to get a TDS meter, I bought one and checked my well water, just to see what it was and it was 176 I then checked the RO water I was getting form LFS thinking I would see 0 well guess what, It's was 336! I then checked some distilled water and that was 0 > I cound't believe it. I bought a RO/DI unit on ebay that same day and just recieve it yesterday. So I would not have know if not for the meter. Also going back to LFS today to see whats been going on, I been using that water since I started my tank I would have been better of using my well water.

Good advice! I'm on it. lol
I also was getting bad water from my lfs and only found out after I ran the regular tests on it.
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Old 04-17-2011, 11:40 PM   #8
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Ok, not to sound like a noob, but what is TDS?
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Old 04-17-2011, 11:41 PM   #9
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total dissolved solids
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Old 04-17-2011, 11:47 PM   #10
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So anything other than zero is bad? What do high readings mean, or do?


Quote:
Originally Posted by Fishguy2727 View Post
IMO there is no point in having an RO/DI sytem if you can't make sure it is working properly with a TDS meter and know when to change the cartridges.
So if your RO/DI water starts to not read zero, you need to replace filters?
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