To see product details, add this item to your cart. You can always remove it later.
Ships from
Ships from
Returns
Returnable until 31 Jan 2026
Returnable until 31 Jan 2026
For the 2025 holiday season, eligible items purchased between 1 November and 31 December 2025 can be returned until 31 January 2026.
Payment
Secure transaction
Your transaction is secure
We work hard to protect your security and privacy. Our payment security system encrypts your information during transmission. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. Learn more
Added to

Sorry, there was a problem.

There was an error retrieving your wish lists. Please try again.

Sorry, there was a problem.

List unavailable.
  • Seachem Flourish Potassium 500ml
  • To view this video, download

Seachem Flourish Potassium 500ml

4.6 out of 5 stars 1,843 ratings
鶹's Choice highlights highly rated, well-priced products available to ship immediately.
鶹's Choice

To see product details, add this item to your cart. You can always remove it later.
Available at a lower price from other sellers that may not offer free Prime delivery.

Purchase options and add-ons

About this item

  • Promotes plant growth
  • Will not affect nitrogen or phosphorous levels
  • Stops yellowing in older leaves

Frequently bought together

This item: Seachem Flourish Potassium 500ml
$27.43($0.05/millilitre)
Get it by Sunday, Nov 16
In Stock
Sold by CANADIAN FULFILLMENTS and ships from 鶹 Fulfillment.
+
$23.32($23.32/count)
In Stock
Ships from and sold by 鶹.ca.
+
$23.03($0.05/millilitre)
Get it by Tuesday, Nov 18
Only 1 left in stock.
Sold by AR Distribution Canada and ships from 鶹 Fulfillment.
Total price:$00
To see our price, add these items to your cart.
Details
Added to Cart
Some of these items ship sooner than the others.
Choose items to buy together.
Brief content visible, double tap to read full content.
Full content visible, double tap to read brief content.

Videos for similar products

Product description

Flourish Potassiumcontains 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.

Product details

  • Is discontinued by manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 19.3 x 3.81 x 3.81 cm; 599 g
  • Date First Available ‏ : ‎ Oct. 26 2011
  • Manufacturer ‏ : ‎ Seachem
  • Place of Business ‏ : ‎ FAIRBURY, NE, 68352 US
  • ASIN ‏ : ‎ B0002APILO
  • Item model number ‏ : ‎ 463
  • 鶹 Rank: #5,911 in Pet Supplies (See Top 100 in Pet Supplies)
  • Customer Reviews:
    4.6 out of 5 stars 1,843 ratings

Product information

Technical Details

Manufacturer ‎Seachem
Place of Business ‎FAIRBURY, NE, 68352 US
Item model number ‎463
Product Dimensions ‎19.3 x 3.81 x 3.81 cm; 599 g
ASIN ‎B0002APILO

Additional Information

Feedback

Seachem Flourish Potassium 500ml


Found a lower price? Let us know. Although we can't match every price reported, we'll use your feedback to ensure that our prices remain competitive.

Where did you see a lower price?

Price Availability
/
/
/
/
Please sign in to provide feedback.

From the manufacturer

Flourish Potassium

  • 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.

Top Brand: Seachem

Highly Rated
100K+ customers rate items from this brand highly
Trending
10K+ orders for this brand in past 3 months
Low Returns
Customers usually keep items from this brand

Important information

Directions

Use 1 capful (5 mL) for every 125 L (30 US gallons). This dose raises potassium by 2 mg/L. Repeat 2–3 times per week or as needed in response to signs of potassium deficiency in older leaves which include: chlorosis (yellowing), necrosis (death/browning), pinholes in leaves, and weak stems and roots.Water VolumeUnitsUS GallonsLitersCurrent K mg/L (ppm)Desired K mg/L (ppm)To reach your desired level usemL (caps)Considerations: Repeat 2–3 times per week or as needed (in response to signs of potassium deficiency in older leaves which includes: chlorosis (yellowing), necrosis (death/browning), and weak stems and roots.

Brands in this category on 鶹

Product Summary: Seachem Flourish Potassium 500ml

From Seachem

4.6 out of 5 stars, 1,843 ratings

Customer reviews

50+ bought in past month

Price

No featured offers available

Other sellers

Other sellers

About this Item

  • Promotes plant growth
  • Will not affect nitrogen or phosphorous levels
  • Stops yellowing in older leaves

Product description

Flourish Potassiumcontains 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.

Feedback

Did you find this product summary feature useful?

Thank you for your feedback
Thank you for your feedback. You selected “Yes, it is useful”
Thank you for your feedback. You selected “No, it is not useful”
Product summary presents key information. Close to see all product details.

Disclaimer:While we work to ensure that product information is correct, on occasion manufacturers may alter their ingredient lists. Actual product packaging and materials may contain more and/or different information than that shown on our Web site. We recommend that you do not solely rely on the information presented and that you always read and follow labels, warnings, and directions before using or consuming a product. This product may not be right for you. For additional information about a product, please contact the manufacturer. Content on this site is for reference purposes and is not intended to substitute for advice given by a physician, pharmacist, or other licensed health-care professional. You should not use this information as self-diagnosis or for treating a health problem or disease. Contact your health-care provider immediately if you suspect that you have a medical problem. 鶹.ca assumes no liability for inaccuracies or misstatements about products.