JZX Oyster Shell (With Bag) – 2kg
Increase and stabilise ph and kh.
- Natural oyster shell will slowly dissolve and release carbonates and calcium ions into the water.
- Increases and stabilises pH and KH over 6 months, preventing dangerous pH crashes or swings in aquarium or pond.
- The oyster shells are thoroughly washed and further cleaned to remove any leftover organic residues.
- Suitable for canister filters, internal filters, top filters, trickle filters, pond filtration, and sump filtration.
| Specification | Value |
|---|---|
| Weight | 2kg |
| Material | Natural oyster shell |
| Application | Aquarium, pond filtration |
| Duration of Effect | Up to 6 months |
FAQ
How long does it take for the oyster shell to start affecting water parameters?
The oyster shell begins to dissolve gradually and starts influencing pH and KH levels over time, typically within a few weeks after addition to the system.
Can this product be used in both freshwater and saltwater aquariums?
This product is designed for freshwater aquariums and ponds. It is not recommended for saltwater systems.
Is the oyster shell safe for fish and plants?
Yes, the oyster shell is safe for fish and aquatic plants as it provides a natural source of calcium and carbonates, helping maintain stable water chemistry.

Elizabeth Hunter –
Used this in my 100-gallon freshwater tank for three months. The pH stayed stable even during water changes. No sudden swings or crashes. The shell dissolves slowly and works well with my filter system. Easy to add and no mess.
Joe Manning –
Good for maintaining consistent KH levels. I noticed a slight increase in calcium after a few weeks. Works best when combined with regular water testing. Not a quick fix, but reliable over time.
Jasmine Mackay –
My pond has been using this for six months now. The water pH remains steady even during seasonal changes. The shell is clean and dissolves without causing cloudiness or sediment issues.