Effect of Muriatic Acid on TDS? - The Planted Tank Forum
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post #1 of 8 (permalink) Old 10-13-2019, 04:57 PM Thread Starter
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Effect of Muriatic Acid on TDS?

Does it make sense that the addition of small amounts (10-20 mL) of muriatic acid to my water raises the TDS somewhat significantly? Does it indicate the presence of something besides HCl in the muriatic acid solution?

Thanks,
Dan
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post #2 of 8 (permalink) Old 10-13-2019, 07:09 PM
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I think the increase in tds would be from the salts formed as the acid reacts with the calcium in the water,as well as any other alkaloids that might be present.

MTS? no,I just need one more tank...
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post #3 of 8 (permalink) Old 10-14-2019, 01:06 AM
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post #4 of 8 (permalink) Old 10-15-2019, 04:20 AM
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As mentioned, the addition of HCl will increase TDS due to the contribution of the chloride anions.
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post #5 of 8 (permalink) Old 10-15-2019, 04:01 PM Thread Starter
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About to Give Up on HCl

I incrementally added 130 ml of "green" muriatic acid to my uninhabited 65 gallon aquarium filled with my well water. After stabilizing a number of days, it's only down to a pH of 7.8 (from 9.0). I didn't check KH, after my most recent dosing, presuming it was still at 7 or 8 dKH (originally 11) judging from tests during previous doses. My old HM Digital COM-100 measured TDS at 351 NaCL @ 65 deg F, up from an original 222 prior to dosing any of the acid. It seems I'm getting the TDS a bit high for livestock (or maybe it was too high to begin with).

Any suggestions as to how high of a TDS reading is dangerous for the Caridina (amongst other small tetras and/or small rainbow fish) I'd like to keep?

It appears I'm going to have to figure out how to make my RO water convenient for water supply/changes and do a mix of well water and RO water rather than relying on the muriatic acid alone to get the water parameters acceptable.

Thanks,
Dan
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post #6 of 8 (permalink) Old 10-16-2019, 01:10 AM
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You might consider peat filtering as well.You can get peat pellets,much cleaner to use.I had success using them years ago when I had a well with liquid rock and a ph that was off the scale of my kit.Managed to breed and raise angelfish successfully that way.

sorta imitates the conditions around the amazon and it's tributaries,or at least that was the theory.
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MTS? no,I just need one more tank...
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post #7 of 8 (permalink) Old 10-16-2019, 01:22 AM
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Do you know your GH? The TDS is probably fine unless you are trying to breed. The only thing high is your pH - which is generally the least of things to worry about. What are you testing pH with... I'm wondering if it's slightly over reading as 9 is quite high I'd have expected harder water. You might be better just picking fish that are tolerant of a wide range and seeing how they do than mucking about with acid which might be tricky to keep stable.

How wet is it where you are? Rainwater is another alternative to RO.
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post #8 of 8 (permalink) Old 10-16-2019, 10:20 PM Thread Starter
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Actually my GH is quite soft at < 10 ppm (API test). I'm measuring pH with an older Milwaukee probe that I recently calibrated (high end) with 7 and 10 pH solutions. And I've used test strips with similar readings. The KH of my well water is 11 degrees according to the API test.

I've given up on using muriatic acid as the sole solution to bringing KH and pH down; it appears it will never achieve the lower pH/KH I'm seeking without sending the TDS exceedingly high, and, as you say, I doubt it will ever be stable. I already have RO but it wasn't convenient to where I'll be mixing my water. I've fixed that today (ran some tubing) and plan on using as much as necessary to bring the well water into acceptable parameters; in fact the tank water will probably be mostly RO. I will likely be using some method to dose calcium (and ferts).

I hadn't thought of rainwater but, yes, we have plenty here. I'll have to check that out along with melted snow.

Thanks a lot,
Dan
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