Seachem Flourish Phosphorus 100ml

Seachem Flourish Phosphorus is a precise potassium phosphate solution that takes the guesswork out of dosing phosphorus in planted aquariums.

• Phosphorus supplement for the planted aquarium.
• A safe 4500 mg/L solution of potassium phosphate.
• Takes the guesswork out of phosphate dosing.

Phosphorus is one of the main three macro nutrients (nitrogen, phosphorous, potassium: NPK) required by plants and can often become the limiting factor to growth in a flourishing system. Flourish Phosphorus is a safe solution (4,500 mg/L phosphate) of potassium phosphate that takes the guess work out of phosphate dosing. Unlike competing products that mix nitrate and phosphate in a fixed ratio, Flourish Phosphorus (being nitrate free) allows you to dose phosphorus according to the needs of your plants without the risk of overdosing nitrates. When used as directed, Flourish Phosphorus will enhance and accelerate the growth of aquatic plants without enhancing algae growth. For maximum benefit, use with Flourish Nitrogen and Flourish Potassium. Flourish Phosphorus™ is safe for invertebrates such as shrimp.

Compatibility

Freshwater planted tanks. Seachem state it is safe for invertebrates such as shrimp.

Dose it only when there is a phosphorus shortfall — stunted new growth and unusually dark green leaves. Surplus phosphate feeds algae, so this is one to test for rather than dose on a schedule.

Pack Size

100 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.