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Potassium fertiliser DIY question

Bailzey

Seedling
Joined
2 Jan 2025
Messages
1
Location
UK
Hi all,

I’m currently scratching my head trying to work this out. My average at best chemistry knowledge is being tested.

I’m looking to make a liquid solution from dry Potassium Sulphate to cure a potassium deficiency in my aquarium.

I’d like to pre-dissolve the dry powder in a water solution so that I can apply it to the aquarium via a dosing pump.

I’m looking to use something like this:
Potassium Sulphate

Now my question is how do I calculate how much dry potassium sulphate powder to add to 500ml of water to yeild a concentration of 1ppm of K per 100L of water after adding 1ml of the solution?

I’m not even sure that would be a workable concentration, but hopefully you get the idea. Unfortunately I’ve spent many years as an electrical engineer and chemistry is certainly not my strong point!
 
use a fert calculator accessible on the link above. It’ll be 111.4 grams.
 

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