RO water PH is 6.4??? - The Planted Tank Forum
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post #1 of 18 (permalink) Old 05-05-2013, 08:17 PM Thread Starter
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RO water PH is 6.4???

Is it possible to have RO water to read a 6.4 PH? I was always under the impression that it would be neutral. Straight out of the tap it is about 7.7

I'm using the typical API test kit with the tubes, not the strips. Expiration date says 12/2016.
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post #2 of 18 (permalink) Old 05-05-2013, 08:27 PM
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Re: RO water PH is 6.4???

My ro water is always 6.4

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post #3 of 18 (permalink) Old 05-05-2013, 08:39 PM Thread Starter
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Quote:
Originally Posted by aquarium hippy View Post
My ro water is always 6.4

Jason
what is yours out of the tap?
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post #4 of 18 (permalink) Old 05-05-2013, 08:54 PM
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I would like to know what his tap is as well to get a product of 6.4 afterwards. Unless its a well, here in north texas the water is typically 7.8 ish from tap. I was under the impression that RO gives you 7.0 pure water as well. How old are all the filters. Is it a DI system as well. 7.7 to 6.4 is a big swing. Are you testing the RO water in a container prior to putting it in the tank or are you testing when its in the tank. If in the tank, is there CO2 going or anything else to soften the water. My RO DI, gives me 7.0 but with my co2 I get 6.7 which is on purpose and my targeted ph.

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post #5 of 18 (permalink) Old 05-05-2013, 08:58 PM
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My Tap is about 7.6 my filters are a couple of months old and the RO that I used to buy from my LFS was 6.4 as well.

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post #6 of 18 (permalink) Old 05-05-2013, 08:59 PM
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Also My PH in the tank is around 6.0 after CO2 injection.

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post #7 of 18 (permalink) Old 05-05-2013, 09:10 PM Thread Starter
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Originally Posted by flight50 View Post
I would like to know what his tap is as well to get a product of 6.4 afterwards. Unless its a well, here in north texas the water is typically 7.8 ish from tap. I was under the impression that RO gives you 7.0 pure water as well. How old are all the filters. Is it a DI system as well. 7.7 to 6.4 is a big swing. Are you testing the RO water in a container prior to putting it in the tank or are you testing when its in the tank. If in the tank, is there CO2 going or anything else to soften the water. My RO DI, gives me 7.0 but with my co2 I get 6.7 which is on purpose and my targeted ph.

No DI flight50. Just the membrane(about 1.5-2 years old) and three filters(1 carbon and two normal cartridges, a 5 and a 10 micron). filters are about 6 months old and I only use about 8 gallons a week on a 75gpd system.

all tests were taken from clean containers and not out of any tanks.
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post #8 of 18 (permalink) Old 05-05-2013, 09:59 PM
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Florida's ground water would rival that of Texas I would imagine with all the limestone our aquifer passes through.
RO without final stage DI used here. Well / tap out of the ground is pH 7.2 - 7.6 depending on how long I let it stand in an open container. KH 196.9 ppm, GH 179 ppm, Phosphate 1.0, Iron (off the scale) Hagen test kit, Nitrate, Nitrite, Ammonia 0.0
Product water in my storage tank measures TDS 2ppm, KH 0.0, GH 0.0. pH can easily read <7.0 due to a complete lack of buffer. It would take very little CO2 to drop the tested reading.

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post #9 of 18 (permalink) Old 05-05-2013, 10:19 PM
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Re: RO water PH is 6.4???

I'll retest when I get home to make sure but I'm pretty sure mine comes out at 6.4

Jason

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post #10 of 18 (permalink) Old 05-05-2013, 10:26 PM
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RO/DI water has nothing in it so there are no carbonates to buffer pH at a fixed point.

Your pH sounds normal.
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post #11 of 18 (permalink) Old 05-05-2013, 10:32 PM
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Jason (and the OP),
Better to know (be concerned with) GH, KH, TDS (mineral content) and ignore pH for the most part in conversations. Starting with a known value it's a good reference for the drop using CO2 but other than that I gave up monitoring pH values.

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post #12 of 18 (permalink) Old 05-05-2013, 10:51 PM
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RO water PH is 6.4???

I really never moniter PH anymore but this thread got me curious.



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post #13 of 18 (permalink) Old 05-05-2013, 10:52 PM Thread Starter
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Quote:
Originally Posted by wkndracer View Post
Jason (and the OP),
Better to know (be concerned with) GH, KH, TDS (mineral content) and ignore pH for the most part in conversations. Starting with a known value it's a good reference for the drop using CO2 but other than that I gave up monitoring pH values.
What test kits would you suggest?(brand)I've always had good luck with API but have considered digital ones, just not sure which are best.

My tap water is TDS 80(6 months ago it was around 150) Out of the RO it is 1.

What do you use for remineralization? I have one tank with blue velvet shrimp and plants(no co2) and setting up another for Cardinal Shrimp(no plants). Thinking of using Salty Shrimp 7.5 for the Cardinal tank and right now I'm just using treated tap water for the Blue Velvet tank.
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post #14 of 18 (permalink) Old 05-05-2013, 11:10 PM
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RO water PH is 6.4???

I use Kent RO rite but Im sure there are better products out there. I have no issues with it but I dont keep shrimp.


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post #15 of 18 (permalink) Old 05-06-2013, 02:04 AM
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Western New York tap water is at 7.6. My RO/DI water is at 6.4. I use Kent RO Right to maintain my GH and KH values to my desired levels. I raise Discus so RO water gives me the ability to set my water parameters to where I need them and and it also supplies me with the soft water conditions that Discus thrive in. Have never had a problem with PH swings either.
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