K

Potassium (K)

Sometimes called 'potash'.

Potassium is an essential mineral micronutrient in all life. So aquatic plants require it in order to grow.

It is most commonly used as a plant fertiliser.

For example:


 * Potassium bicarbonate (KHCO3) also called Salt of Tartar or Kaligreen.
 * This increases KH without increasing GH and adds K and CO2. Increases pH.


 * Potassium carbonate (K2CO3)
 * This increases KH and GH. May increase pH.


 * Potassium nitrate (KN03)
 * This is very commoningly used as a part of the PMDD (Poor Man's Dosing Drops) mix to add nitrate to a tank.


 * Potassium hydroxide (KOH)
 * Used to increase pH without affecting GH or KH.

Links

 * The Krib - Practical PMDD Information
 * PMDD mixes US