Super high GH, tips?
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Old 04-01-2013, 11:33 PM   #1
Unikorn
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Super high GH, tips?


What PH and GH values do you have? I have a GH of 20-22 drops, a KH of 2 drops, and the PH straight from the tap is 8.4-8.6 its actually darker than that color.

How do you guys lower the GH using FL tap water?
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Old 04-01-2013, 11:34 PM   #2
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Do you use R/O from a machine at the pet store or Distilled from the super market?
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Old 04-02-2013, 12:04 AM   #3
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I don't know about my GH but my pH is about 8.2 and my tap water also has 0.5 ppm ammonia which is also annoying. I mix tap water with R/O from a nearby pet store.
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Old 04-02-2013, 12:11 AM   #4
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awesome, thanks
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Old 04-02-2013, 12:37 AM   #5
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My pH generally runs from 7.2 at night to 7.4 during the day after several hours with the lights on. MY dH runs about 100 mg/L and I try to keep my KH around 107 mg/L. I have had luck mixing 40% RO water with 60% conditioned fresh water from the LFS where I help out at. I then aerate the water for a good 4 hours or so before doing a WC and adding to the tank. I run DIY CO2 so I believe it has very little sway over my pH. I believe a little experimentation on your part will have to occur to see what the impact will be. In the past (the old days) the safest method was to boil the water then let it cool over a days time. I have to admit that I do not remember the impact this had on alkalinity though. Maybe another experiment for you.

Your general hardness is going to have a bigger impact on your fishes osmoregulation so careful adjusting so as not to shock your fish should be considered.

Have fun

Last edited by Idrankwhat; 04-02-2013 at 09:05 AM.. Reason: mispelled
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Old 04-02-2013, 11:59 PM   #6
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Quote:
Originally Posted by Idrankwhat View Post
My pH generally runs from 7.2 at night to 7.4 during the day after several hours with the lights on. MY dH runs about 100 mg/L and I try to keep my KH around 107 mg/L. I have had luck mixing 40% RO water with 60% conditioned fresh water from the LFS where I help out at. I then aerate the water for a good 4 hours or so before doing a WC and adding to the tank. I run DIY CO2 so I believe it has very little sway over my pH. I believe a little experimentation on your part will have to occur to see what the impact will be. In the past (the old days) the safest method was to boil the water then let it cool over a days time. I have to admit that I do not remember the impact this had on alkalinity though. Maybe another experiment for you.

Your general hardness is going to have a bigger impact on your fishes osmoregulation so careful adjusting so as not to shock your fish should be considered.

Have fun
Sorry for the basic question, but do you mind telling me what aerating the water before doing the WC does?
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Old 04-03-2013, 03:39 PM   #7
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Quote:
Originally Posted by valen1014 View Post
Sorry for the basic question, but do you mind telling me what aerating the water before doing the WC does?
RO water is devoid of anything including dissolved O2. Also you can get false pH reading from newly processed water especially if it contains trapped CO2. For safety sake I always aerate my WC water before I do the change and add it to the tank. I know what I'm working with then.
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Old 04-03-2013, 06:56 PM   #8
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That's a really good idea! I would have never known!
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Old 04-03-2013, 08:05 PM   #9
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We learn from each other my friend.
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Old 04-04-2013, 05:47 PM   #10
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Quote:
Originally Posted by Idrankwhat View Post
RO water is devoid of anything including dissolved O2. Also you can get false pH reading from newly processed water especially if it contains trapped CO2. For safety sake I always aerate my WC water before I do the change and add it to the tank. I know what I'm working with then.
Hmmm, I don't think that's true. It's my understanding that RO membrane does not remove dissolved gasses.

A random google:
"Reverse osmosis cannot remove dissolved gases"
http://cals.arizona.edu/pubs/water/az9419.pdf

Do let me know if I'm missing something as I wouldn't want to add water w/o o2.
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Old 04-04-2013, 07:07 PM   #11
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A regular resin water softener will remove the GH, but it replaces it with sodium. Some people say thats bad but I've not had any problems.
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Old 04-05-2013, 11:09 PM   #12
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Quote:
Originally Posted by BraveBuc View Post
Hmmm, I don't think that's true. It's my understanding that RO membrane does not remove dissolved gasses.

A random google:
"Reverse osmosis cannot remove dissolved gases"
http://cals.arizona.edu/pubs/water/az9419.pdf


Do let me know if I'm missing something as I wouldn't want to add water w/o o2.
We're going to check our output with a Hanna dissolved O2 meter. By all documentation you're right. We run our water through a high capacity water conditioning system and then into our RO/DI system so I'm curious if that is affecting it. I'm curious now, but, I'll let you know what we find.
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Old 04-07-2013, 01:21 PM   #13
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Quote:
Originally Posted by Idrankwhat View Post
We're going to check our output with a Hanna dissolved O2 meter. By all documentation you're right. We run our water through a high capacity water conditioning system and then into our RO/DI system so I'm curious if that is affecting it. I'm curious now, but, I'll let you know what we find.
okay, we had no way to isolate our RO/DI system from the Blue Rhino system, but a check with freshly produced RO water from the reservoir yielded about 42% dissolved oxygen. So yep, I was wrong but that is pretty low.
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