Tetra CrystalWater, 100 ml is a product for quickly clearing aquarium water. According to the description, selected minerals remove all kinds of cloudiness: the active ingredients bind fine particles into larger ones, which the aquarium filter then traps. After dosing, a white cloud appears in the water, a sign that the product is working; it is harmless and disperses within a few hours. First results show after 2–3 hours, and within 6–12 hours the water becomes clear. It suits all freshwater aquariums. The dose is 5 ml per 10 l, so a bottle treats 200 l.
Key specifications
| Parameter | Value |
|---|---|
| Type | water clarifier (flocculant) |
| Action | binds fine particles into larger ones |
| First results | after 2–3 hours |
| Clear water | after 6–12 hours |
| Dose | 5 ml per 10 l |
| Treats | 200 l |
| Aquariums | freshwater |
Pros
- Fast effect. First results within 2–3 hours.
- Works with the filter. Clumped particles are caught by the sponge.
- Visibly working. The white cloud shows it has started.
- Safe for fish and plants. According to the manufacturer.
- Simple dosing. 5 ml per 10 l.
- For any freshwater aquarium.
Cons and what to watch
- Does not remove the cause. Overfeeding, a bacterial bloom or a weak filter will still be there.
- No ingredients. The minerals are not named.
- Repeat dosing not described. It does not say when you can dose again.
- The filter clogs faster. It will need cleaning after clearing.
- Freshwater only.
How to use
Measure 5 ml for every 10 l of tank water and pour it into the strongest filter flow. Keep the filter running while the product works, as it collects the clumped particles. After 6–12 hours, once the water has cleared, rinse the filter sponge in tank water, since all the collected debris has settled on it. The manufacturer stresses that regular filter cleaning is needed for good results.
Where cloudiness comes from
White cloudiness in a new tank is usually a bacterial bloom: bacteria multiply faster than the balance settles. It often clears by itself within a few days, especially if the filter is seeded with bacteria such as Tetra Bactozym. Grey cloudiness comes from poorly rinsed substrate, green from algae with too much light. In a mature tank it is most often linked to overfeeding; see aquarium fish food: how to feed.
The filter does the work
A clarifier only works together with a filter. If the filter is too weak for your volume, particles will not be trapped well. For small tanks up to 60 l, consider the Resun Magi-200, and for fine polishing add JBL Symec filter floss.
Similar products
JBL Clynol, a mineral conditioner for cloudy and discoloured water, works in a similar way. To keep water parameters stable overall, stabilisers such as Tetra Easy Balance are used.
Test the water
If cloudiness appears suddenly in a mature tank, check ammonia and nitrite, as a sudden haze can come with poorer water quality. Test strips such as Tetra Test 6in1 are handy. If the readings are bad, do a water change first and clarify afterwards.
The white cloud
After adding CrystalWater the water turns milky for a while. This is normal and, according to the description, safe. Do not panic or add another dose: the cloud disperses within a few hours and the water becomes clearer.
Storage
Keep the bottle tightly closed in a cool, dark place out of reach of children. Do not let it freeze.
Who it suits
Tetra CrystalWater suits owners of freshwater aquariums who need clear water quickly, for example before guests arrive or after replanting, provided the cause of the cloudiness is dealt with. Other products are in the fish medicines and water care section, and setting up a tank is covered in aquarium for beginners.
Verdict
Tetra CrystalWater is a water clarifier that uses minerals to clump fine particles so the filter can catch them, with results visible after 2–3 hours and clear water within 6–12 hours. The downsides are that it does not remove the cause of cloudiness, the ingredients are not disclosed, repeat dosing is not explained, and the filter needs cleaning afterwards.
FAQ
What is the dose?
5 ml per 10 l of water.
How fast does it work?
First results after 2–3 hours, clear water after 6–12 hours.
What is the white cloud?
A sign the product is working; it is harmless and disperses within hours.
Should the filter be switched off?
No, the filter collects the clumped particles.
Is it safe for fish?
According to the description, yes.
Can it be used in a marine tank?
No, freshwater only.
How much water does it treat?
100 ml treats 200 l.
