Solubility of Ferts in Stock Solution - The Planted Tank Forum
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post #1 of 5 (permalink) Old 10-17-2018, 02:45 PM Thread Starter
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Is the solubility of the salts we use in our solutions independent of others or are they cumulative?

The reason I'm asking is I've setup my 500ml solution with a 40ml dose (3x/week) and I get a cumulative solubility % above 100%
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Last edited by Darkblade48; 10-18-2018 at 12:09 AM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #2 of 5 (permalink) Old 10-18-2018, 12:13 AM
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The "common ion effect" will influence the overall solubility of the salts you are adding, which is why the calculator is giving a warning.

Also, it is not a good idea to mix up a stock solution containing both phosphates and micronutrients, as iron (III) phosphate can form, resulting in a precipitate as well.
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post #3 of 5 (permalink) Old 10-18-2018, 01:10 AM Thread Starter
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Originally Posted by Darkblade48 View Post
The "common ion effect" will influence the overall solubility of the salts you are adding, which is why the calculator is giving a warning.

Thanks, That's what I suspected. I reduced the K since I'm dosing about 7ppm with the Seachem Lake Salts I'll need with the water changes. (my tap has a dGH of 0-1 - I need it all).

Also, it is not a good idea to mix up a stock solution containing both phosphates and micronutrients, as iron (III) phosphate can form, resulting in a precipitate as well.

Well aware but thanks for the reminder. I wrote the spreadsheet for my own use originally and just took that as a given.
I'm going to add FG to the trace mix to make up for the effective worthlessness of the EDTA in the CSM @ 8.0-8.2 pH. I'd like to dose 7 days as a consequence but for both Macros & Micros. Is there a precipitation hazard there? If needed I could dose the Macros the night before and Micros in the morning.
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post #4 of 5 (permalink) Old 10-18-2018, 02:13 AM
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Its OK to dose macros and micros at the same time. It's not OK to mix them in the same solution (unless you know what you're doing and take preventative measures)

As for the solubility issue, you could dry dose K2SO4 for the whole week right after doing a water change. That's the main thing causing a solubility problem


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post #5 of 5 (permalink) Old 10-18-2018, 10:29 AM Thread Starter
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Thanks again.

Now if I could just come off Nitrite watch and get on with this ...

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