Water Quality: Activated Carbon

What is it?

You read more and more often that activated carbon It is used in pond systems. However, it's not new in the ornamental fish world and has been used in aquariums for much longer. Activated carbon is a treated carbon (usually coal as a base) with the purpose of purification through adsorption. Its fine structure (pores) allows it to bind molecules that are attracted to the carbon. It is used in air treatment systems, extractor hoods, gas masks, and water purification, among other things. It is also used in medicine, by taking it in pill or capsule form for example, in cases of food poisoning. There are many processes and base materials for activating carbon, and depending on the method, different substances can be bound. Activated carbon cannot be regenerated, unlike zeolite or nitrate resin. When it becomes saturated, it must be replaced. This, of course, depends on the pond's pollution and the amount of activated carbon used.

Addition to filter installation .

Activated carbon is intended to complement your existing filter system, not as a replacement for the material your nitrifying bacteria rely on. The biggest effect you'll see is a very clear water. Dyes that give the water a slightly yellowish or brownish hue are captured by the carbon. Activated carbon is also suitable for removing toxins from the pond. For example, it can absorb residual medication after treatment. If you decide to treat the pond, it's important to temporarily remove the activated carbon, as this will negate the effectiveness of the medication. After the treatment period, you can replace it to remove any residual medication and any discoloration it may cause.

Usage .

Activated carbon The activated carbon has a fine grain structure and crumbles easily. You don't want this loose in your pond. Therefore, first place the activated carbon in a special, water-permeable bag. A pair of pantyhose can also be useful. It creates a lot of loose carbon because the grains rub against each other during transport and handling. Therefore, rinse the water-permeable bag containing the carbon thoroughly before using it in the pond, for example, by dipping it a few times in a bucket of water and shaking it out thoroughly. Place the bag in a location with a high flow of water, ideally at the end of your filter line, because the water there will be free of solid particles and the carbon will be less likely to clog.

Author: Joop van Tol (Koitoday)