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Author Topic: so how much ro or distilled water is enough to lower GH?  (Read 2349 times)
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« on: June 25, 2015, 09:01:21 PM »

I'm not exactly new to fish/tanks/aquatic plants, but in the past I have more or less caved into the idea that all I would be able to grow in my planted tanks were the hardiest of plants & fish.

I live in TX 2 blocks from the upper Galveston Bay.  Still pretty salty out there...

However, like all Gulf Coast tap water (if there's an "Eden" I don't know of it) mine is high pH and high GH.

I yearn after plants & fish that prefer softer water... I have run across the advice "add ro / distilled water" to change GH, but haven't seen any charts of how much to add.  I have a couple of nano tanks, a 55 gal, and a 29gal.  How much added ro/distilled should I add when making a 20% water change?
Does this have a cumulative effect on the tank? i.e., will I have to add less & less over time? 
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« Reply #1 on: June 27, 2015, 04:41:35 PM »

Welcome to the forum kaytlu

There are no formulas because it depends on how hard your base water is to start with.  I have found a ratio of 19:1 works great with my rock hard Ohio well water.  That's 19 parts RO/Distilled/Rain Water to 1 part well water.

If you know the parameters you are shooting for, just start doing a daily 1 gallon water change using your preferred "soft" water and after several hours record the results.  At some point you will hit the parameters you are looking for and then you can start doing your regular water changes using mixed you determined get you where you want to be.  You may need to tweak it a bit, but as long as you don't have substrate that adds buffering to your tank water, you should be able to arrive at a suitable mix.

Once you have your mix down pat, it's easy enough to alter the water parameters plus or minus as the occasion arises.


When i read things that say that wont work....
I mostly smile and think , yeah right 
Whoa. Where did I put all my stuff?
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« Reply #2 on: June 28, 2015, 06:40:23 PM »

What is the GH of your aquarium and what kind of fish do you wish to keep?

"For every difficult question, there is an answer that is clear and simple and wrong."
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« Reply #3 on: July 01, 2015, 03:47:41 PM »

What is the GH of your aquarium and what kind of fish do you wish to keep?

Our advise is pretty restricted unless we know the answers to these questions.

Put me back out to sea to play with the fishies...I don't belong on land!  [img width= height=" border="0][/img]
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