new RO and hi pH - The Planted Tank Forum
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post #1 of 8 (permalink) Old 09-09-2019, 09:31 PM Thread Starter
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new RO and hi pH

Hello, I bought a new RO unit for general household use; it's super nice and easy to use for my everyday drinking water.

Can I use this for my fish tank: TDS is about 50, kH 3 and GH 3, but the pH is 8.5! It is a small 10 gallon planted cube and I want to keep mosquito or some other small raspbora, otos, and dwarf goby.

I guess if I had to I could buy RO water and mix it? I really cannot haul large bottles every week! Any comments would be very helpful!

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post #2 of 8 (permalink) Old 09-10-2019, 12:22 AM
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Yeah you can get splitters from Amazon. And tubing as well. $10 for 100’ LDPE. My split goes from under my sink to the basement on the other side of the home where I prepare the water
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post #3 of 8 (permalink) Old 09-10-2019, 12:12 PM Thread Starter
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Yeah you can get splitters from Amazon. And tubing as well. $10 for 100 LDPE. My split goes from under my sink to the basement on the other side of the home where I prepare the water
Hello, not sure what you mean. This is not a whole house unit, just a countertop, not plumbed in. Can I use this water with these parameters in my tank?

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post #4 of 8 (permalink) Old 09-10-2019, 12:49 PM
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Hello, not sure what you mean. This is not a whole house unit, just a countertop, not plumbed in. Can I use this water with these parameters in my tank?
They were just mentioning that they split it off from one source into two. One for their drinking and the other for their aquarium needs.

And yes you can use that for your tank. I would suggest to look into raising the GH to at least 6 if you plan to use it for your tank. Or you can mix it in with your tap water like 50/50 for example.


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Last edited by Econde; 09-10-2019 at 12:50 PM. Reason: Clarification
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post #5 of 8 (permalink) Old 09-10-2019, 12:56 PM
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Can I use this for my fish tank: TDS is about 50, kH 3 and GH 3, but the pH is 8.5! It is a small 10 gallon planted cube and I want to keep mosquito or some other small raspbora, otos, and dwarf goby.
Something does not seem right.

RO water should be zero KH and pH near 7.0. And even at 3 KH, pH should be at about 7.3/7.4 fully degassed.

Are you adding anything to bring the KH up to 3? Are you measuring water in the tank? Directly from the RO unit? Letting the water settle/age for a few days? How are you measuring pH?

Just seems like something is missing from this picture.
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post #6 of 8 (permalink) Old 09-10-2019, 10:23 PM Thread Starter
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Something does not seem right.

RO water should be zero KH and pH near 7.0. And even at 3 KH, pH should be at about 7.3/7.4 fully degassed.

Are you adding anything to bring the KH up to 3? Are you measuring water in the tank? Directly from the RO unit? Letting the water settle/age for a few days? How are you measuring pH?

Just seems like something is missing from this picture.
Hi, thanks for comments. I did make a rookie mistake! I took the initial readings with water from the RO unit, I did not let the water sit. After sitting overnight, I got a reading of TDS 35, pH 7.5, dKH and dGH at 2. I have a TDS meter and the Sera test kits. Much better, right?

This is a countertop 4 stage RO unit made to produce drinking water, so they focus on taste! Zero Installation Purifier.

This unit has a filter for Alkaline pH or a new filter which gives 0 TDS.

I could bring up the dKH, dGH with equilibrium or Salty Shrimp. I could also mix with RO I buy from the store where the pH is 7 and 0 KH. My tap water is nasty. Is a pH of 7 too low so I should try to mix and bring the pH and dKH and dGH it up a bit? Is there one approach more desirable?

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post #7 of 8 (permalink) Old 09-10-2019, 11:25 PM
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Originally Posted by fish+plants View Post
Hi, thanks for comments. I did make a rookie mistake! I took the initial readings with water from the RO unit, I did not let the water sit. After sitting overnight, I got a reading of TDS 35, pH 7.5, dKH and dGH at 2. I have a TDS meter and the Sera test kits. Much better, right?

This is a countertop 4 stage RO unit made to produce drinking water, so they focus on taste! Zero Installation Purifier.

This unit has a filter for Alkaline pH or a new filter which gives 0 TDS.

I could bring up the dKH, dGH with equilibrium or Salty Shrimp. I could also mix with RO I buy from the store where the pH is 7 and 0 KH. My tap water is nasty. Is a pH of 7 too low so I should try to mix and bring the pH and dKH and dGH it up a bit? Is there one approach more desirable?
Aha that makes more sense.

So you have an Alkaline pH filter that brings up KH/GH/pH just a bit, correct?

If so, KH 2 is fine and in fact desirable for the plant side of the equation. You will probably want to bump GH a bit (6 to 8). All you need is CaSO4 and MgSO4.

And good to see another Michigander here!


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post #8 of 8 (permalink) Old 09-11-2019, 12:08 PM Thread Starter
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Ha, yea Michigan, we are having summer in the fall now! Now if Michigan would just get their football in shape.

Thanks so much for your input! Yes, I have the alkaline pH filter which sounds like it is fine, no need to get the 0 TDS one? I am going to test again just to check myself!

I was using Shrimpy GH/KH+ as I was thinking of adding shrimp. Is this one ok? Or Equilibrium? I am not familiar with the CaS04 and MgS04 and where to get or how to use. I will research; I image it is calcium and magnesium. I do use Excel, UNS all in one plant food, UNS controsoil and some seiryu stone.

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