recommendations for weird tap water - The Planted Tank Forum
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post #1 of 10 (permalink) Old 04-28-2019, 05:16 AM Thread Starter
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recommendations for weird tap water

Here is the numbers,,, Around 3 KH, hardly any GH and a PH of 10! Or, are my numbers wrong? What would you do to make this good for heavily planted, high light and co2 Using ADA aqua soil & power sand. Using E.I or pps pro... I do have a r.o system. Thanks for any input!


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post #2 of 10 (permalink) Old 04-28-2019, 02:33 PM
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You are right, it is weird water. Though we see this more often lately, here is one similar to yours.

Your tap has up to 0.34 ppm ammonia as N, pH 10, sulfate 200 ppm, TDS up to 900 ppm, chloramine 2.3 ppm. I wouldn’t drink it, I would use the RO unit for sure. As for the aquarium, you need a large container or another aquarium to prepare the RO water for water changes.

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post #3 of 10 (permalink) Old 04-30-2019, 04:52 AM Thread Starter
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I guess sreaight RO water with salty shrimp to re mineralize... Any other suggestions?
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post #4 of 10 (permalink) Old 04-30-2019, 12:09 PM
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I guess sreaight RO water with salty shrimp to re mineralize... Any other suggestions?
KHCO3 for kH

CaSO4 + MgSO4 for gH

Go here to get amounts needed to reach goals:

https://rotalabutterfly.com/nutrient-calculator.php

Saves money and offers more control compared to off-the-shelf boosters.
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post #5 of 10 (permalink) Old 04-30-2019, 01:59 PM
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Reconstituted RO water:
30 ppm Ca, (CaSO4)
5 ppm Mg, (MgSO4)
1 dKH, (KHCO3 or NaHCO3 baking soda)

ADA substrate buffers pH to 6.0 – 6.4 so the KH shouldn’t be high.
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post #6 of 10 (permalink) Old 04-30-2019, 04:58 PM Thread Starter
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Thanks Edward!

So if my math is correct....My barrel is 50 gallons. Fill w/ RO water and add:

19.29g CaSO4

9.6g MgSO4

102g NaHCO3 "baking SODA"
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post #7 of 10 (permalink) Old 04-30-2019, 06:57 PM
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Small corrections, the 19.29g applies to (CaSO4).1/2H2O but we usually use easily available (CaSO4).2H2O, so 24.4g. MgSO4 is correct at 9.6g. And baking soda NaHCO3 only 5.7g, not 102g.

RO reconstitution per 50 gallon:
30 ppm Ca, 24.4g (CaSO4).2H2O
5 ppm Mg, 9.6g MgSO4.7H2O
1 dKH, 5.7g NaHCO3 baking soda
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post #8 of 10 (permalink) Old 04-30-2019, 07:03 PM
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Small corrections, the 19.29g applies to (CaSO4).1/2H2O but we usually use easily available (CaSO4)2.H2O, so 24.4g.
Wondering what (why they are different) the difference is?

I'm dosing roughly 1/3 less than I originally thought using (CaSO4).1/2H2O in rotalabutterfly calc's instead of (CaSO4)2.H2O

What would 100% gypsum powder be classified as?

https://www.amazon.ca/Baker-and-Cros...gateway&sr=8-2

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post #9 of 10 (permalink) Old 04-30-2019, 09:50 PM Thread Starter
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Wondering what (why they are different) the difference is?

I'm dosing roughly 1/3 less than I originally thought using (CaSO4).1/2H2O in rotalabutterfly calc's instead of (CaSO4)2.H2O

What would 100% gypsum powder be classified as?

https://www.amazon.ca/Baker-and-Cros...gateway&sr=8-2

This is from wiki:
Hydration states and crystallographic structures

The compound exists in three levels of hydration corresponding to different crystallographic structures and to different minerals in the nature:

Just started filling my RO barrel. Got about 10gallons into it and tested the water. TDS = 28 P.H is 10!!!! Why so high?

Last edited by Darkblade48; 05-01-2019 at 05:09 AM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #10 of 10 (permalink) Old 05-01-2019, 02:01 PM
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Just started filling my RO barrel. Got about 10gallons into it and tested the water. TDS = 28 P.H is 10!!!! Why so high?
The usual RO rejection rate is 90 – 95 % which means that 5 – 10 % elements go through. Your tap water has 423 ppm TDS so after RO you should have 20 – 40 ppm TDS. Your measurement of 28 ppm TDS indicates normally functioning RO system.

And the after RO pH of 10 doesn’t mean anything important because there is very little remaining pH related ions. Once this water is in aquarium the pH will change.
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