Brightwell Phosphat-E 250 ml — Reef Phosphate Remover - Brightwell

Brightwell Phosphat-E — liquid phosphate remover for marine and reef aquariums

The Brightwell Phosphat-E is a liquid phosphate remover that starts to strip reactive phosphate the moment it hits the aquarium. The product binds the free form of phosphate into a particulate that mechanical filtration and the protein skimmer then export from the system. Safe for the inhabitants of a fish-only marine tank as well as a reef aquarium stocked with corals and invertebrates.

Each millilitre removes 1 ppm of phosphate from 4 US gal (15.14 L) of water — a 250 mL bottle treats up to 1,000 US gal (3,785 L). Brightwell claims a potency more than 50 % higher than most competing phosphate removers.

What Phosphat-E is for and when to use it

• Knocking down a PO₄ spike — a tank sitting above 0.05 ppm, the ceiling Brightwell states a reef should not sit past for any extended period.
• Alternative to GFO media — helpful when a granular reactor is not installed or not desired.
• Backup for a bacterial routine — supports a probiotic method or a carbon-dosing routine that has plateaued on PO₄ uptake.
• Targeted correction in algae zones — used as a slow-drip dose to avoid coral irritation when phosphate has been sitting high for 3 to 6 weeks or longer.

Brightwell official dosing

• Ratio: 1 mL of Phosphat-E eliminates 1 ppm of phosphate in 4 US gal (15.14 L) of water.
• Basic dose: 2.5 mL (½ capful) per 20 US gal (76 L) daily, which removes 0.5 ppm of PO₄ from the system.
• Maximum dose: 0.5 mL per 4 US gal (15.142 L) daily — do not exceed.
• Add the product near a mechanical filter or protein skimmer intake so the resulting particulate gets captured.
• Reef target: keep PO₄ below 0.05 ppm long term.
• If corals or invertebrates react negatively after dosing, reduce the dose by 50 %.

Brightwell warnings

• Too rapid a decrease in phosphate can irritate sensitive corals, particularly when PO₄ has been sitting at an elevated level for 3 to 6 weeks or more.
• Phosphate test kits may show a false positive immediately after dosing — wait several hours before retesting.
• Harmful if swallowed. May cause eye or skin irritation.

Specifications

• Brand: Brightwell Aquatics (made in the USA)
• Available sizes: 250 mL, 500 mL, 2 L, 20 L
• Composition: purified water and proprietary phosphate removers
• Type: liquid phosphate remover (not a supplement)
• Compatibility: marine and reef aquariums (fish, SPS, LPS, softies, inverts)
• Coverage: 250 mL treats up to 1,000 US gal (3,785 L)

Why choose Brightwell at ReefSolution

• Brightwell Extrax Phos — the granular phosphate remover for a media reactor when the PO₄ budget outgrows what liquid dosing comfortably handles.
• Brightwell MicroBacter7 — the bacterial culture that amplifies biological uptake of PO₄ and NO₃ when combined.
• Salifert Phosphate Test Kit — the 0.01 ppm reference test needed to pilot every dosing step.

Frequently asked questions

How fast does Phosphat-E drop phosphate?

Each millilitre removes 1 ppm of PO₄ in 4 US gal (15.14 L). On a 100 US gal system, the basic 12.5 mL dose (2.5 mL per 20 US gal) therefore strips 0.5 ppm in one day. An accurate 0.01 ppm phosphate test is essential to steer the dose — Brightwell notes that too rapid a drop, especially on a tank that has been sitting high for several weeks, can irritate corals.

Where should Phosphat-E be dosed in the sump?

Brightwell recommends adding the product near a mechanical filter or protein skimmer intake. The resulting compound is particulate and needs to be captured by mechanical filtration or lifted out by skimmer foam before it can redissolve — dosing away from those exports reduces effectiveness.

What should I do if corals close up after a Phosphat-E dose?

Brightwell states it plainly: if corals or other invertebrates react negatively to the addition, the dose is too aggressive — cut it by 50 % and retest after 24 hours. The reef target still is under 0.05 ppm PO₄, reached progressively rather than in a single heavy dose.

Why does my phosphate test read higher right after dosing?

Test kits may show a false positive immediately after adding Phosphat-E — an artefact Brightwell documents on the product page. Wait several hours, let mechanical filtration and the skimmer do their work, then retest for a representative reading.