wondering about RO water and pH - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 10-21-2018, 05:52 AM Thread Starter
Algae Grower
 
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wondering about RO water and pH

So I've been thinking of using RO water because my tap water is pretty freakin' toxic especially for a shrimp tank. However, after running some water tests, I found that in addition to having 1.0 ppm of ammonia (yikes) the tap water that I've been using also has a pH of about 8.4. The water in my tank is about 7.5.

I'm guessing that the piece of driftwood and the soil substrate I'm using helped lower the tap water's pH to this level, and I wouldn't be surprised if they kept things in balance. So, I'm kind of concerned... RO water's pH is the same as my tank's, 7.5. If I use it, will the pH drop? Or will it not really matter?
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post #2 of 3 (permalink) Old 10-21-2018, 06:11 AM
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Providing the RO water out of your system has a dKH of 0, that will make the pH unstable.

If you wish to target a specific pH using RO, you could use Seachemís Acid and Alkaline Buffers together to buffer the water for a specific value. Or you can add baking soda to add dKH to stabilize the pH.


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post #3 of 3 (permalink) Old 10-21-2018, 02:06 PM
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You could go to a LFS that caters to Marine and Reef hobbyists. They sell RO/DI by the gallon for folks with Nano-Reef tanks (Take your own jug just in case). Then do a mix with your tap in small quantities. That way you can check the results (GH,KH, pH, etc.) with minimum expense and zero risk before you lay down the coin for $100 - $200 system.

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