Hanna 711 vs 761 Checker?
- Thread starter tomreefer
- Start date
Depend on the range of what you testing the one will be suitable...
The 761 is for ultra low range 0 to 500 ppb(part per billion), while the 711 if for 0 to 3.5ppm(part per million)
So if you are trying to measure something equal or lower than 500ppb you better go with 761 it will give you more granularity that the 711 will not..
Question is, why you need to measurme chlorine? This is first time I see someone trying to measure it in the hobby..
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The 761 is for ultra low range 0 to 500 ppb(part per billion), while the 711 if for 0 to 3.5ppm(part per million)
So if you are trying to measure something equal or lower than 500ppb you better go with 761 it will give you more granularity that the 711 will not..
Question is, why you need to measurme chlorine? This is first time I see someone trying to measure it in the hobby..
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What I was told this will tell you when you need to replace your carbon blocks on your RO.
This article
http://reefkeeping.com/issues/2003-11/rhf/feature/index.php
This article
http://reefkeeping.com/issues/2003-11/rhf/feature/index.php
Oh wow. Man just get a TDS meter. If you have rodi unit get yourself a 3 ports TDS meter like this one and add it to your system.
Change filters based on which port is reading above zero...
https://www.bulkreefsupply.com/dual...zxe6xBlliJSNN1Pp9SSWK5Gn8gbx-o3EaAqCVEALw_wcB
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Change filters based on which port is reading above zero...
https://www.bulkreefsupply.com/dual...zxe6xBlliJSNN1Pp9SSWK5Gn8gbx-o3EaAqCVEALw_wcB
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I have one and has nothing to do with TDS, lol
Tds meter will not show how much Chlorine or Chloramine you are removing or have. Therefore, you can either be replacing your carbon blocks to fast or not enough. Chloramine is for sure deadly read the article for more info.
Disinfection Byproducts like Trihalomethanes, Volatile Organic Compounds, METHYL tertiary-butyl ether, chlorine, chloramines, cysts and lead are the primary contaminants to Public Water Systems. They have no impact on the conductivity of the water. Yet these do not register on a TDS meter.
TDS Meter measures solids like Calcium, Magnesium and Salts. Another great article is this
https://www.hydroviv.com/blogs/water-smarts/tds-meters-and-testers
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You missed my point.
I understand tds will not measure chloramine or chlorin.
My point was, a tds meter will give you better indication when you need to change filters in your RODI and more convenient than doing tests and buying reagents.
This is the way it's done for RODI systems, using TDS ad an indicator we need to change filters.
But by all means, you can measure chloramine and chlorine even cupper and metals if you like
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Never heard if that.
Your waste water will have all type of junk, if you measure you would measure your rodi line not waste line isnot it?
Now, if your rodi output is reading zero, and your tds meter is correct, this means you have zero chlorine in the water. That I can guarantee you
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https://www.youtube.com/watch?v=LJz2_fEJixE
That is what Bulk Reef Supply says to check your waste water before membrane. I think if you measure the ro line before di this is after membrane, you want to check before it hits membrane from my understanding.
That is what Bulk Reef Supply says to check your waste water before membrane. I think if you measure the ro line before di this is after membrane, you want to check before it hits membrane from my understanding.
Yup, as I said, it's not wrong to test for chlorine, its hassle that can be avoided by the tds since tds tells you more than what chlorine test alone would tell you, and will avoid tests, reagents and test errors.
Having the tds meter at input of the unit will tell you your source tds
At output of the carbon block will tell you the effectiveness of the carbon block
At the output of the di will tell you your di resine effectivness. That's 3 tds measurment points, hence 3 port tds meter is most common with RODI systems.
Pressure meter will give you good indication on the ro membrane health...
Nothing wrong with doing more, I will just say this, I am willing to bet that BRS is not testing chlorine on their waste water...
But hey..whatever works
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TDS meters will measure anything that changes the conductivity of the water, which would include any ions like chlorine. Chloramine itself is covered in the article given, so I won't say much more here. If I wanted to measure RO/DI, I'd probably go for the 761, but your area might be different. The level of chloramine in the water might be covered in a water report for your area. If it's very high, I might be tempted to get the other unit, but most likely, the RO/DI will start with a low level of chlorine in it, and I'd want to detect that.
I suspect that a good TDS meter will be good enough, though. Once the DI phase starts its decline, the total TDS should be detectable before a dangerous amount of chloramine is getting through. That approach seems to work for people. If you are very worried, using two DI phases is a reasonable idea. Once the TDS of the first DI cartridge starts rising, switch the DI phases and replacing the failing cartridge will give very pure water.
I suspect that a good TDS meter will be good enough, though. Once the DI phase starts its decline, the total TDS should be detectable before a dangerous amount of chloramine is getting through. That approach seems to work for people. If you are very worried, using two DI phases is a reasonable idea. Once the TDS of the first DI cartridge starts rising, switch the DI phases and replacing the failing cartridge will give very pure water.
thanks [MENTION=10192]bertoni[/MENTION] for clearing that up. Interesting, I read that TDS meters don't detect chlorine.
I just purchased the Hanna 711. At current moment I have a 5 stage RODI 1st Sediment; Chlorine Grabber Block; Chloramine Block; DI and 98% reject rate membrane. My TDS is here is very high 476 it reads.
According to my towns report:
Chloramines 0.5 -1.4ppm -- Chlorine 0.48 - 1ppm
https://www.livingstonnj.org/DocumentCenter/View/8399/Water-Quality-Report-2019
I just purchased the Hanna 711. At current moment I have a 5 stage RODI 1st Sediment; Chlorine Grabber Block; Chloramine Block; DI and 98% reject rate membrane. My TDS is here is very high 476 it reads.
According to my towns report:
Chloramines 0.5 -1.4ppm -- Chlorine 0.48 - 1ppm
https://www.livingstonnj.org/DocumentCenter/View/8399/Water-Quality-Report-2019
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So do you think my towns Chloramines high?
