High PH problems need help!! - The Planted Tank Forum
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post #1 of 19 (permalink) Old 02-05-2016, 09:49 PM Thread Starter
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High PH problems need help!!

Hello everyone I am new to the site.
I have 130 gallon fully planted tank with tetras and rainbows and fluval Fx6. Recently the my water company has raised the PH level in Tap water up 8.8. So I went ahead and purchased a RO system and installed last night. Well out of RO system my GH and Kh are both around 2-3 dkh and my PH only came down to 8.4. I do not want to add PH down unless I absolutely have too. But I'm looking for help to lower to around 7.2-7.4. Please help
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post #2 of 19 (permalink) Old 02-05-2016, 10:21 PM
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try a bag of peat moss in the filter.you can get peat pellets made specifically for this,but the moss works very well IME.it'll soften and lower the ph,though it might give the water a tea color.

MTS? no,I just need one more tank...
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post #3 of 19 (permalink) Old 02-05-2016, 10:28 PM
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A GH of 2dGH means that just the hardness elements (Ca++, Mg++) have a concentration in your RO output of around 45 ppm. Either your tap water has an extremely high TDS, the RO unit is faulty, or there is some error with the installation.

Consult with the RO manufacturer before doing anything else.

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post #4 of 19 (permalink) Old 02-05-2016, 11:02 PM Thread Starter
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Sorry for the bad info. I just now took a water test of my RO system and the GH and KH are both at 0.
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post #5 of 19 (permalink) Old 02-05-2016, 11:17 PM
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You should double check the pH from the RO unit. It should be closer to 5.6 pH. Do you have a TDS meter?

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post #6 of 19 (permalink) Old 02-05-2016, 11:26 PM Thread Starter
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Unfortunately I do not have a TDS meter. And I just check it again and it is still at 8.4. I thought for sure since the RO strips the water down it would let the PH fall also but it has yet to happen. I have also flushed my RO 8 times in the last 24 hours to see if that would even help and it did not.
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post #7 of 19 (permalink) Old 02-05-2016, 11:34 PM
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From here, I would purchase a TDS meter. It will help to determine what is happening. If you want to be sure that everything is being stripped from the water, also try to purchase an addon to your RO unit that will allow the use of DI resin.

But get the TDS meter first, because if the TDS is high from your RO unit, the DI resin will be used very quickly and push the cost of running the system up.

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post #8 of 19 (permalink) Old 02-05-2016, 11:56 PM Thread Starter
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What does a DI actually do?
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post #9 of 19 (permalink) Old 02-06-2016, 12:00 AM
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Have you tried letting your water sit over night before testing ph, if there is any dissolved gases it could affect ph as well


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post #10 of 19 (permalink) Old 02-06-2016, 12:36 AM Thread Starter
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I am in the process of doing that tonight. But will gases really keep my PH level that high?
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post #11 of 19 (permalink) Old 02-06-2016, 01:09 AM
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High PH problems need help!!

You should really have a tds monitor to properly diagnose any issues with your membrane.

If the PH is higher then it once was then it's possible the performance of your r/o membrane is not putting out a nice low tds anymore.
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post #12 of 19 (permalink) Old 02-06-2016, 01:30 AM
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Quote:
Originally Posted by Cyattexas View Post
What does a DI actually do?
A new RO membrane should be expected to have a performance around 96% or better. In other words, it strips 96% of the inorganic ions from the water.

DI resin will strip 100% of inorganic ions from the water using a different process then the RO membrane. The issue with DI resin is that it can only strip so much from the water, and then it's useless. By using an RO membrane first, you reduce the workload on the DI resin and increase it's lifespan considerably.
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post #13 of 19 (permalink) Old 02-06-2016, 01:51 AM Thread Starter
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Water guy: thank you and I agree totally I plan on going out tomorrow to find a TDS meter. The RO system is brand new and was installed yesterday, Ph out of my facet is 8.8 and out of RO system is only down to 8.4.

Can you tell me where I could possibly find one these meters?
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post #14 of 19 (permalink) Old 02-06-2016, 01:54 AM Thread Starter
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Audio nut: thank you for the explanation, but my question is would that 4% really keep my ph up that high?
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post #15 of 19 (permalink) Old 02-06-2016, 01:56 AM Thread Starter
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So I knows in a pool system you can add murradic acid to it lower the ph, can you do that same thing to water that would be added to the aquarium to lower the ph? Just curious
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