Potassium Sulfate | K2SO4 | 1lb

(11 customer reviews)

K2SO4 Fertilizer for Planted Tanks: 1lb


Potassium Sulfate – K2SO4 for Aquarium Plants  0-0-52

Potassium Sulfate (K2SO4) is a source of Potassium (K) necessary for protein synthesis and for plants to metabolize Iron (Fe).  Sulfur (S) is essential for root development. Potassium Sulfate is useful alternative to kcl when chloride sensitive plants are present.

Dosing Instructions

1/16th tsp into 10 gallons will add 5ppm potassium

Guaranteed Analysis

Soluble Potash(K2O) 52%
Sulfur(S) 18%

Information regarding the heavy metal content of this product can be found at Association of American Plant Food Control Officials


  1. Ssam (verified owner)

    Just what I was looking for to raise K without hitting N as well.

  2. Plantedrich (verified owner)

    I like the ability to add just the potassium when I already have an excess of nitrate. Just so simple and so cheap to test when unsure of what the deficiency may be. Excellent price, service, and speed make it a great value!

  3. Plantedrich (verified owner)

    Dry ferts are by far the cheapest, store very easy and last a long time but the best part is that I can adjust exactly as each tank needs rather than adding parts I don’t want to tanks which are already high in those.

  4. Luke (verified owner)

    Great product. Customer service is way above and beyond any other.

  5. James Reed (verified owner)

    This ia a great product and cant go wrong with any of their fertilizers. Great price and fast great service.

  6. Dave (verified owner)

    Good product. Nice packaging. Swift delivery.

  7. Anonymous

    A whole pound for $3 is very reasonable and what you get looks to be without impurities. I ordered all my fertilizers at once to save on the shipping

  8. Bradley McNutt

    There are several places to buy dry fertilizers. Nlocg is the lowest price by far. Well packaged, and great customer service. Can’t go wrong

  9. Anonymous

    I’ve ordered dry fertz here a few times, shipping is always quick and well packaged.
    My plants look great.

  10. Anonymous

    I really recommend this product. All of my plants are doing GREAT!!
    Nick is very knowledgeable and very helpful. I will be purchasing all my ferts here in the future.
    I am a happy customer 🙂

  11. Anonymous

    I like the new packaging!

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