Brightwell Aquatics Phosphāt-E Liquid Phosphate Remover, 500 ml, for marine fish and reef aquariums

Dose this liquid phosphate remover into marine fish and reef aquariums, pouring the measured amount where a mechanical filter or protein skimmer draws water in. A 500 ml bottle reaches up to 8,000 US gallons, and the daily maximum is 2.5 ml per 20 gallons, a dose that removes 0.5 ppm of phosphate.

Checks before the first dose

Phosphāt-E suits marine fish tanks, reef tanks and freshwater aquariums. A phosphate test result is the starting point: measure the tank's concentration with an accurate kit before the first use, because the numbers in the dose table are built around that reading. Each 250 ml of product covers 1,000 gallons, so a 500 ml bottle handles twice that volume; the initial application eliminates 1 ppm of reactive phosphate in 4 gallons.

Two things happen after dosing. The tank may turn slightly cloudy right after the product goes in, which the brand describes as normal and temporary. Phosphate kits can also return a false positive after treatment, because of how the test chemistry reacts with the product.

Adding Phosphāt-E to the system

Dose no more than 2.5 ml per 20 gallons in a single day, which reduces phosphate by 0.5 ppm. Pour the measured amount beside the mechanical filter or at the skimmer's water intake, as the directions state. The process can be repeated on a continuing basis for phosphate reduction.

What the bottle holds and covers

The product leaves 1 ppm of reactive phosphate out of 4 gallons of water each time it is applied, and the daily 2.5 ml per 20 gallon dose brings phosphate down by 0.5 ppm.

Freshwater tanks are included alongside reef and marine fish systems, so the same bottle serves more than one type of aquarium. The model number is POE500, and the included component is the Phosphāt-E bottle itself.

Questions about dosing and use

How far does one bottle go?

Up to 8,000 US gallons, based on 250 ml per 1,000 gallons. That is twice the 4,000 US gallons a 250 ml bottle handles.

What is the largest daily dose?

The maximum is 2.5 ml per 20 gallons of tank water per day. At that rate, phosphate falls by 0.5 ppm.

Where in the aquarium should I add the product?

Beside a mechanical filter or at a protein skimmer's water intake, so the dose stays close to the filtration equipment.

Does it work in a freshwater tank?

Yes, it is safe for freshwater aquariums as well as reef and marine fish environments. The same dosing and application directions apply.

Why does my phosphate test show a reading after treatment?

Phosphate test kits may give false positive results after dosing, because of the chemical mechanism the kits use. The cloudiness some tanks show right after application is normal and temporary.