Seachem Prime Aquarium Water Conditioner 250ml

Seachem Prime 250ml is a highly concentrated aquarium water conditioner ideal for larger aquariums, multiple tanks and fishkeepers carrying out regular water changes.

Prime removes chlorine and chloramine from tap water while temporarily detoxifying ammonia, nitrite and nitrate, helping protect aquarium livestock during water changes, new tank setup and temporary water-quality problems.

With a standard dose of just 5ml per 200 litres, one 250ml bottle can treat up to 10,000 litres of aquarium water.

Key Features and Benefits

• Highly concentrated aquarium water conditioner
• 250ml bottle treats up to 10,000 litres
• Removes chlorine from tap water
• Removes chloramine
• Temporarily detoxifies ammonia
• Temporarily detoxifies nitrite and nitrate
• Ideal for larger aquariums and multiple tanks
• Excellent for regular water changes
• Suitable for freshwater and marine aquariums
• Can be used during aquarium cycling
• Non-acidic and will not significantly affect pH
• Economical choice for frequent aquarium maintenance

Ideal for Larger Aquariums

The 250ml size is particularly useful for fishkeepers maintaining larger aquariums or several tanks.

Because Prime is highly concentrated, only a small amount is required at each water change.

At the standard dose:

One 250ml bottle can treat approximately 10,000 litres of water at the standard dosage.

Why Use Seachem Prime?

Australian tap water may contain chlorine or chloramine as part of municipal water treatment.

These disinfectants are useful for drinking water but can be harmful to aquarium fish and beneficial filter bacteria.

Prime conditions tap water by removing chlorine and chloramine before the water affects aquarium livestock or biological filtration.

It can be used whenever water is added or replaced.

Prime & Chloramine

Prime & Ammonia

Seachem Prime does not permanently remove ammonia from the aquarium.

Instead, it temporarily binds ammonia into a less toxic form while keeping it available for beneficial bacteria to process.

This can provide additional protection during:

• Aquarium cycling
• Temporary ammonia spikes
• New tank setup
• Increased aquarium bioload
• Unexpected water-quality problems

Prime should always be used alongside appropriate filtration, water testing and aquarium maintenance.

Using Prime During Water Changes

For normal water changes, use:

5ml Prime per 200 litres of new water.

Seachem Prime During Aquarium Cycling

Prime can be used while establishing the biological cycle in a new aquarium.

The ammonia, nitrite and nitrate temporarily detoxified by Prime remain available to beneficial filter bacteria.

This allows the biological filtration system to continue developing.

Prime can also be paired with a beneficial bacteria product such as Seachem Stability during new aquarium setup.

Suitable for Freshwater & Marine Aquariums

Seachem Prime can be used in both freshwater and saltwater aquariums.

It is suitable for a wide variety of freshwater setups including:

• Community aquariums
• Cichlid tanks
• Planted aquariums
• Aquascapes
• Betta aquariums
• Shrimp tanks
• Large display aquariums
• Multi-tank fish rooms

Concentrated & Economical

Prime is highly concentrated, making the 250ml bottle a practical option for customers who use water conditioner frequently.

For example, a 200-litre water change uses only 5ml of Prime.

That means a 250ml bottle provides approximately 50 standard 200-litre treatments.

For customers maintaining large tanks or several aquariums, this can make the 250ml bottle more convenient than continually replacing smaller bottles.

Does Seachem Prime Affect pH?

Prime is non-acidic and should not significantly alter aquarium pH when used according to directions.

This makes it suitable for aquariums maintained across a wide range of freshwater conditions.

Important Information

A sulphur-like smell from Seachem Prime is normal and does not indicate that the product has spoiled.

Always follow the manufacturer's dosage instructions.

Prime temporarily detoxifies ammonia, nitrite and nitrate rather than physically removing them from the aquarium, so adequate biological filtration and regular water testing remain important.

Product Specifications

Frequently Asked Questions

How much water does Seachem Prime 250ml treat?

At the standard dose of 5ml per 200 litres, a 250ml bottle treats approximately 10,000 litres of aquarium water.

How much Seachem Prime should I use?

Use 5ml for every 200 litres of water, which is approximately 1ml per 40 litres.

Is the 250ml Prime better for large aquariums?

Yes. The larger bottle is particularly suitable for larger aquariums, multiple tanks and customers carrying out frequent water changes.

Does Seachem Prime remove chlorine and chloramine?

Yes. Prime removes both chlorine and chloramine from tap water.

Does Seachem Prime remove ammonia?

Prime temporarily detoxifies ammonia rather than physically removing it. The ammonia remains available for beneficial filter bacteria to process.

Can Seachem Prime be used during aquarium cycling?

Yes. Prime can temporarily detoxify ammonia and nitrite during cycling while still allowing them to remain available to beneficial bacteria.

Can I add Prime directly to my aquarium?

Yes. Prime can be added directly to the aquarium, although adding it to replacement water first is preferred where practical. If dosing directly into the aquarium, base the dose on the aquarium's total volume.

How often can Seachem Prime be used?

Prime can be used whenever new tap water is added or replaced. Seachem also advises that it may be re-dosed every 24–48 hours when required for temporary detoxification of ammonia, nitrite or nitrate.

Why does Seachem Prime smell like sulphur?

A sulphur-like smell is normal for Prime and does not mean the product is faulty.

Can Seachem Prime be used with Seachem Stability?

Yes. Prime and Stability can be used together and are particularly useful when setting up or cycling a new aquarium.