Description
Seachem Safe 1kg — Super-Concentrated Dry Water Conditioner for Large Tanks, Ponds and Fish Rooms
A kilogram of Safe conditions a million litres of tap water, which is why fish rooms and pond keepers switch to the powder once their volumes climb. Seachem Safe 1kg (SKU: 725018-387) is Seachem’s complete, super-concentrated dry conditioner for fresh and salt water. It removes chlorine and chloramine and detoxifies ammonia, nitrite and nitrate through a binder that renders them non-toxic while leaving them available to the biofilter, so it can be used during cycling. Seachem states that it is non-acidic, does not affect pH and will not over-activate reef skimmers, and the dry form is the reason it is so economical for large systems.
The dose from the 1 kg tub is 1.25 g, a quarter teaspoon, for every 1,250 L to remove chlorine and chloramine, or 1.25 g per 300 L to detoxify ammonia. Heavy chloramine takes a double dose, a nitrite or nitrate emergency up to four times, and above 30 °C with low chlorine and ammonia a half dose. At the chlorine rate a kilogram treats 1,000,000 L; at the ammonia rate about 240,000 L. It cannot be pre-mixed and stored, lacking a liquid conditioner’s stabilisers, so each dose is made fresh. Seachem also names it for neutralising bleach when regenerating Purigen, about 16 g per cup of water.
Usage & Application
When to Use
- Large water changes: Displays and ponds where liquid conditioner is used by the bottle.
- Fish rooms and shops: Central systems and many tanks conditioned from one tub.
- Ammonia and nitrite spikes: Detoxifying a reading while the biofilter catches up, including during cycling.
- Purigen regeneration: The bleach-neutralising step Seachem specifies for its own resin.
Dosing & Administration Guide
- Chlorine and chloramine: 1.25 g (a quarter teaspoon) per 1,250 L of new water.
- Ammonia: 1.25 g per 300 L; double for heavy chloramine, up to four times for a nitrite or nitrate emergency.
- Hot weather: Half dose above 30 °C when chlorine and ammonia are low.
- Mix fresh: Dissolve each dose as it is used; never make up a liquid stock to store.
Product Specifications & Highlights
Key Features
- Complete conditioner: Chlorine, chloramine, ammonia, nitrite and nitrate in one powder.
- Super-concentrated: 1 kg treats 1,000,000 L at the chlorine rate.
- Fresh and salt water: Non-acidic, no pH effect, does not over-activate skimmers.
- Cycling-safe: Binds toxins without starving the biofilter.
- Purigen partner: Seachem’s named neutraliser for resin regeneration.
Product Details
- Brand: Seachem
- SKU: 725018-387
- Barcode (GTIN/UPC): 000116038706
- Product Type: Additives & Supplements > Water Conditioner (Dry Concentrate)
- Net Weight: 1 kg
- Function: Removes chlorine and chloramine; detoxifies ammonia, nitrite and nitrate
- Dose Rate: 1.25 g (1/4 tsp) per 1,250 L for chlorine and chloramine; 1.25 g per 300 L for ammonia; up to 2× for heavy chloramine, up to 4× for nitrite or nitrate emergencies
- Treatment Capacity: 1,000,000 L at the chlorine rate; about 240,000 L at the ammonia rate
- Storage: Do not pre-mix and store as a liquid
- Range Sizes: 50 g, 250 g, 1 kg and 4 kg
- Target Environment: Freshwater and saltwater aquariums and ponds


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