PH, KH and GH from my tap - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 05-19-2017, 11:19 PM Thread Starter
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PH, KH and GH from my tap

I've known my tap water PH for awhile now, but I finally decided to test my KH and GH expecting it to be high as well. Here are my results:

PH = 8.2
KH = 7 dKH or 125 ppm
GH = 8 dGH or 143 ppm

I don't want to deal with RO water, so what are the implications for using my tap for a planted tank? I'm currently planning an ambitious 120 gallon planted tank, but I've never grown plants. I've had neon tetras, Burmese border loaches, shrimp, and snails in this water for months without problems.

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post #2 of 8 (permalink) Old 05-20-2017, 11:42 AM
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I don't think your water is bad at all. I use RO/DI water and mix that up to 4 dkh and 4 dgh, which is very soft. Your only about double that. You should be fine for most typical fish and plants. Of course, check requirements for individual species.
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post #3 of 8 (permalink) Old 05-20-2017, 07:55 PM Thread Starter
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Originally Posted by DaveK View Post
I don't think your water is bad at all. I use RO/DI water and mix that up to 4 dkh and 4 dgh, which is very soft. Your only about double that. You should be fine for most typical fish and plants. Of course, check requirements for individual species.
Awesome. Thanks Dave. I've read that most fish species can adjust to a much wider range pH than is recommended, especially captive bred fish. And it seems like a soft water fish would adjust easier to hard water than a hard water fish to soft water. Same for plants.

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post #4 of 8 (permalink) Old 05-23-2017, 12:52 AM
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It's not too bad. Probably fine for most species, excluding specialists like blackwater fish or Rift Lake cichlids.

But I find the converse of your last post to be true. Soft water fish in hard water do not live their full lifespan potential. Soft water plants in hard water will often die, while many 'hard water' plants can be kept in soft water given good growing conditions.

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post #5 of 8 (permalink) Old 05-23-2017, 01:19 AM Thread Starter
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Originally Posted by Axelrodi202 View Post
It's not too bad. Probably fine for most species, excluding specialists like blackwater fish or Rift Lake cichlids.

But I find the converse of your last post to be true. Soft water fish in hard water do not live their full lifespan potential. Soft water plants in hard water will often die, while many 'hard water' plants can be kept in soft water given good growing conditions.
Really? I've been reading Diana Walstad's Ecology of the Planted Aquarium which is where I got that from. Heresy in these parts, I know! (I'm mainly reading it for the science. I'm actually planning a hi tech tank). Anyway, I'll need to refer to the exact section to explain it better as it's been a while, but she made it sound like hard water fish depend on the additional salts, so transitioning to soft water was very difficult. Conversely, soft water fish just had more than they needed, so the transition wasn't so bad. I'll look it up in a bit and try to make sure explain her idea better. She didn't say much about plants in that section though if I remember right.

Also, I only have 4 months experience, so I should probably take your word for it. Lol

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post #6 of 8 (permalink) Old 05-23-2017, 11:26 AM
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Certain parts of the book are quite outdated by now. It is true that hard water fish may struggle to get enough minerals in soft water, but soft water fish have the opposite problems. Their kidneys are not evolved to deal with such a high mineral content in hard water, leading to overstraining and eventually early death.

In this hobby you will find that sometimes your experience contradicts widely asserted notions/belief. Go with what you've found for yourself, not what someone says should be right.

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post #7 of 8 (permalink) Old 05-27-2017, 07:38 PM
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7 and 8 are pretty average. I wouldn't worry about that at all. My well water is 15 and 16 with a ph of 8.4. I cut it with 50% RO just to get it where yours is and that seems to be good.
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post #8 of 8 (permalink) Old 05-27-2017, 07:52 PM
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My tap water is hard as rocks. I haven't measured it yet, but looking at the precipitate on the glass and faucet, etc....it must be astoundingly high. Seems to fine though

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