MasterLine Potassium

MasterLine Potassium

  • Potassium fertiliser
  • Perfect fo batch fertilisation
  • Simple fertilisation principle without much to calculate
  • Available in 500 ml and 1000 ml
In stock
Free shipping on orders over € 60,- within Germany Change region
Express delivery possible
1-3 business days - order within the next hour and 57 minutes and we’ll deliver tomorrow at the earliest
I want to order to 
€ 22,90 / l
incl. VAT
plus € 5,90 Shipping
Item is now in your shopping cart!
View my cart

Item question

We’re here for you!

Please enter your question and e-mail and we’ll contact you as soon as possible. It usually takes us up to 24 hours during business days to respond.

Thank you for your question!

Thank you, we’ll get in touch!

Close window

You already sent us a question.

Please wait a few minutes


MasterLine Potassium is a potassium fertiliser for aquatic plants. Potassium is one of the three most important macronutrients for plants, which are essential for healthy plant growth. As a mobile nutrient element, it plays an important regulatory role for the water balance of the plant and in enzymatic reactions.
MasterLine Potassium can be combined with all other single component fertilisers from MasterLine. However, the fertiliser can also be used as an addition to All In One fertilisers in order to specifically adjust certain nutrient levels.



  • Straight potassium fertiliser without trace elements
  • Prevents leaf damage due to nutrient deficiency symptoms
  • Supports the formation of new leaves
  • Simple application without calculating much
  • Suitable for batch fertilisation
  • Combinable with MasterLine single nutrient fertilisers or MasterLine All In One fertiliser
  • Available in 500 ml and 1000 ml bottles


1 ml of MasterLine Potassium per 30 litres of aquarium water adds the following nutrients:
K 1 mg/l

Potassium is dosed as needed when the concentration has decreased below 15 mg/l.
The recommended dosage is only a guideline. Depending on the aquarium, the dosage of the fertiliser can be reduced or increased to achieve optimum results.


Shake bottle well before use. Store in a cool place and without direct sunlight.



MasterLine was founded in 2016 out of passion for aquaristics, which has since become the brand's slogan. Masterline fertilisers contain a balanced mix of nutrients that are essential for the healthy growth of aquatic plants. The Masterline fertiliser system is designed to be particularly effortless to use and takes the user by the hand with a very simple concept. The specially calculated compositions provide the aquatic plants with all the necessary macro and micro nutrients and ensure good growth and vibrant colours.

General information

Item no.
EAN 9355478926293
Weight 1,20 kg
Shipping weight 1,50 kg

Customers ask customers

You have questions about this product? Ask other customer or our support team about this product!

Customer reviews

This item has been rated 5 out of 5 stars
One review
Please sign in if you want to write a review. Sign in
5 Stars(1)
4 Stars(0)
3 Stars(0)
2 Stars(0)
1 Star(0)
Master Line Potassium
18th April
MasterLine - Potassium - 1000 ml
MasterLine - Potassium - 1000 ml

top product im using Master line gold and it is amazing :D