NT Labs Koi Care Zeolite WIth Filter Media Bag (5kg) | Natural zeolite chunks absorb ammonia and reduce nitrite levels when placed inside an external pond filter compartment.

I had an ammonia spike in my koi pond, dead leaves decomposing in the filter. I bought 10kg of this put it on the supplied bag tied it to the side of the pond and dropped it in. 3 days later, ammonia back to normal. Very good product and highly recommended.

Excellent product, does the job; the nice strong net bag supplied really helps

the product was priced fairly and arrived on time

very good at getting rid of certain impurities in your pond try it

Excellent

These are not chunks as described, but tiny chips. The net bag provided doesn't even hold the bits in. I had to get a bag with smaller holes.

Good stuff

Item arrived early and in good condition. Item was bigger than expected but nothing a hammer and a cloth could not sort out bag which comes with it is a good size and will last for a good time. Now in filter and ammonia level has dropped so now removed and at pres staying under control. Will use seller again when i want more.