| At these times, there are two other filter media that | | | | are added. Remove zeolite from the filter before |
| can help to reduce pollution levels present in the | | | | adding salt as a pond treatment, otherwise the |
| water. Zeolite and activated carbon clean the water | | | | ammonia the zeolite contains will be dumped back |
| by chemical rather than biological means. | | | | into the pond. |
| They are also useful in a new biological filter system | | | | It may also remove other pond water treatments if |
| while you wait for the colony of oxygenating | | | | left in place. Activated carbon will remove many |
| bacteria to mature. Zeolite is a naturally occurring | | | | pollutants from the water by adsorption. It is not |
| substance and is graded by size. | | | | normally used continuously, but only when needed, |
| If placed on a tray in a filter chamber, it will remove | | | | for example to remove pond treatment mechanicals. |
| ammonia from the pond water. Once saturated, it | | | | When the many pores that is created by applying |
| loses its effectiveness, so remove it from the | | | | heat during manufacture are full, the carbon is |
| system and recharge it by immersing it in a salt | | | | exhausted and must be replaced. Several types of |
| solution. | | | | activated carbon are manufactures, but only use |
| This action releases the ammonia and, after a | | | | those made for aquatic purposes. |
| thorough rinsing in clean water, it can be replaced in | | | | In addition to a well designed filter system |
| the filter chamber for further use. Zeolite is useful in | | | | incorporating suitable media, there are devices that |
| temporary quarantine or medication ponds that do | | | | further improve the water quality in the koi pond. |
| not have an established filter. | | | | While not being absolutely necessary, they will |
| It can also be employed in the main pond filter when | | | | certainly make a noticeable difference to the clarity |
| an increased load is present, such as when new fish | | | | of the water and your view of the koi in the pond. |