MTS - Is Muriate of Potash damaging? - The Planted Tank Forum
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post #1 of 3 (permalink) Old 01-25-2016, 08:16 AM Thread Starter
Algae Grower
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MTS - Is Muriate of Potash damaging?

I am about to start a new aquascape and was searching for the best substrate for it. While looking at MTS I saw that they use a bottom layer of Muriate of Potash (KCI) on the glass for a K boost when starting the tank. Not knowing what that was I googled it and came across this site -

Explained: why muriate of potash fertiliser could be killing your soil

The sentence "Free chloride in the soil solution may reduce activity of fungi, bacteria, algae and other soil microorganisms that are vital for healthy soil function" has me worried.

Will this affect our aquarium ecosystem?

Could we just swap out the KCI for KS2O4 to the same effect?

Is the Free chloride from the KCI the reason MTS is said to reduce algae blooms when starting a tank?
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post #2 of 3 (permalink) Old 01-26-2016, 05:06 AM
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Don't mix soil bio-chemistry with what happens in the fish tank. Soil fertiliser regimes are far more concentrated than in aquatic environments and the accumulation of the chloride ion due to long use of muriate of potash in crop fields is a problem for the farmer.

Chlorine accumulation does not take place in our tanks because of the routine of water changes that we follow - we only have to keep a watch that our supply water does not have unusual concentrations of chlorine.

The need for chlorine in our aqua-systems is at trace levels. So replacing muriate of potash with K2SO4 can be followed without any harm. Enough chlorine ions are available in our supply water for us to need an addition of more.

If you have a choice, you have a problem, till you elect your choice. No choice, no problem, only consequences, learn to live with them.
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post #3 of 3 (permalink) Old 01-26-2016, 10:55 AM Thread Starter
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Thanks, that makes a lot of sense. I give MTS a shot for this next scape.
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