Seachem Flourish Potassium, 500 ml

If you notice that the leaves of your aquarium plants are turning yellow, the reason is most likely a potassium deficiency. Flourish Potassium™ is a highly concentrated source (50,000 mg/L) of potassium for planted aquariums. It consists of potassium sulphate, which does not add nitrogen or phosphorus or affect them.

Recommended use:

Add 1 capful (5 ml) per 125 litres of aquarium water. This will increase the potassium content by 2 mg/L. Repeat this process 2-3 times a week. You can also use Flourish Potassium™ if you notice signs of potassium deficiency.