NT Labs
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Koi Care - Zeolite



Rapid Ammonia Removal

  • Filter Bag Included.
  • Also reduces toxic Nitrite and Nitrate levels.
  • Maintains the health and vitality of your fish.
  • Large 10-35 mm chunks.
  • Ideal for large filters.
  • Can be re-charged.
  • Can be used for decorative effect in the pond.

When to Use:

  • For best results use all the time and re-charge regularly.
  • When poor water quality is detected/suspected add more.

Test your water quality first using Pondlab test kits.


Available in the following variations:


Stockist Finder

Simplified map of the United Kingdom.

Find your nearest NT Labs Authorised Retailer.


Let us calculate your dosage for you!

To make the process of using our products even easier this handy dosage calculator tells you the amount you will need to put into your system. Please ensure you also read the instructions and warnings that are written on the bottle/pack label.

I know my system's measurements and want to:

Calculate my volume
Dosage calculator

Calculate dosage

You’ll require*
0 g

* Always follow the instructions on the label. This calculator is intended to be used only as a guide to how much product you need to buy to treat your system. It does not take account of displacement caused by gravel, rocks and ornaments etc and does not include the volume of any external filtration system. NT Laboratories Ltd. will not accept any responsibility for inaccuracies or misuse of this guide.