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post #1 of 5 Old 07-16-2012, 06:55 PM Thread Starter
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RO Water Parameters

Today I went to the LFS and got 10 gallons of RO water for my 10 gallon breeding tank. Im breeding some cherry barbs but the tap water is extremely hard. I use Seachem brand replenish RO water mineral replacement to increase the hardness of the water. I have always used RO water and added the amount of Replenish I needed to raise the hardness of the water. I never test the water before I add the supplement because I assume that the water is stripped of its hardness. This time since fry will live in the tank for a while I decided to test the GH and KH of the RO water before I added the supplement. The GH read 120 ppm while the PH was at 6 and the KH was at 0. I was a little shocked to see that the GH was at 120 ppm and not near 0. Now I have not added the supplement because I dont know if the water is hard or soft. The one thing that I can think of thats causing this is the fact that I use Test strips and not liquid test kits for the water hardness. What should I do and is the test right or inaccurate?
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post #2 of 5 Old 07-16-2012, 07:30 PM
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Well, 120 ppm GH is most certainly not RO water lol.

RO water should be 0 GH, 0 KH, and 7.0 pH. It should be pretty darn close to pure water.

You can try taking a water sample to a petstore that uses the liquid tests for water hardness, if any around you do.

Have you asked the store you buy it from if they add anything to the water? Have you told them what your tests read?
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post #3 of 5 Old 07-17-2012, 12:19 PM
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Agree, I would confirm those readings. However, if they are correct as you state them, you actually have ideal water for your purpose without adding anything. A GH of 120 [= 6 dGH] and a pH of 6 is perfect for soft water fish.

BTW, the pH for RO water is generally slightly acidic, so this is not surprising.

Byron.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #4 of 5 Old 07-17-2012, 05:43 PM Thread Starter
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Yeah I knew that the ph was fine and I also know that the GH is perfect, but what about the KH I need to get that up without raising the GH.
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post #5 of 5 Old 07-17-2012, 06:53 PM
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Quote:
Originally Posted by Zooman77 View Post
Yeah I knew that the ph was fine and I also know that the GH is perfect, but what about the KH I need to get that up without raising the GH.
KH is irrelevant to fish and plants. It does buffer pH, but this is not usually an issue. I have near-zero KH.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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