Seachem Flourish Potassium 500 ml

• Potassium supplement for the planted aquarium.
• Highly concentrated (50,000 mg/L).
• Does not contain phosphate or nitrate making it ideal for use with Flourish Nitrogen and Flourish Phosphorus.

Flourish Potassium contains 50,000 mg/L of potassium suitable for the natural planted aquarium. Potassium is one of several elements that are vitally important to maintaining a vigorous level of growth in a planted aquarium. Potassium can become depleted in a rapidly growing system or when the source water has a low mineral content. In these cases potassium could become the limiting factor to growth. Use Flourish Potassium to prevent potassium depletion (signs of which include yellowing in older leaves) and maintain the highest level of growth.

The most easily obtained sources of potassium are potassium nitrate and potassium phosphate. Both of these sources add to either nitrogen or phosphorus as well as potassium, making it virtually impossible to target a specific NPK ratio. Flourish Potassium is derived from potassium sulfate, allowing the user to adjust potassium levels without affecting nitrogen or phosphorus.

Compatibility

Freshwater planted tanks, and safe with shrimp and other invertebrates — including Amano shrimp — at the stated dose.

Note that Seachem do not make a potassium test kit, so dose to the plants’ appearance: pinholes and yellowing edges on older leaves are the usual sign of a shortfall.

Dosage & Directions

A 41,500 mg/L potassium solution. Use 5 mL for every 125 L (30 US gallons) two or three times a week, which raises potassium by about 1.66 mg/L each time.

Pack Size

500 mL bottle.

Seachem make this line in sizes from 100 mL to 4 L

Buy the size you will get through in a reasonable time and keep the bottle closed, cool and out of direct sun. A part-used bottle that has stood open for a year is poorer value than a small fresh one whatever it cost per millilitre.

Freshness & Storage

Every batch we dispatch carries a minimum of 6 months’ remaining shelf life. Store this product in a cool, dry place away from direct sunlight, with the cap or inner foil closed tightly after each use.

Returns & Replacement

Returns are accepted within 7 days of delivery, provided the item is unused and in its original packaging. Manufacturer-sealed items cannot be returned once the seal is broken, and sale-priced items are not refundable.

If your item arrives defective or damaged, message us on WhatsApp with your order number, or email us if you would rather, and we will replace it. Approved replacements are delivered within 3 to 5 business days. Transit damage is covered by insurance on every shipment. If tracking shows delivered but nothing reached you, tell us within 72 hours, which is the reporting window Indian couriers allow. Damage caused during installation or use is not covered; replacement spares for such cases are chargeable.

Full terms are on our Cancellation & Returns page.