Another way to help remove pond smells is with regular water changes, which will help bring fresh water and oxygen to the system. A drawback of water changes is that beneficial bacteria will be removed in the process and hard chemicals, such as chlorine, will be introduced to the pond. If you’re considering performing water changes to help reduce the smell in your pond, consider treating water with dechlorifier products to remove chlorine and beneficial bacteria products to stabilize natural levels.
Activated carbon can also be added to your filter box to help remove harsh chemicals which can be left as residue in tap water.
Water changes can certainly help reduce bad pond smells, but they may not be able to remove the cause, so the smell may eventually return. For example, a water change will not be able to reduce pond sludge from the bottom of the pond. It also won’t provide aeration to stagnant water in the long run, or stop new algae from growing. Water changes should be carried out alongside other forms of pond maintenance to ensure water odors don’t slowly return.
As well as water changes, pond equipment should be properly maintained and cleaned. Pumps need to be cleaned if there is a reduction in water flow, and water features removed of algae and debris to provide good surface aeration. Overgrown plants should be trimmed back, and dead plants and fish removed asap before they have time to decay. One of the easiest ways to prevent problems with pond smells is to simply make sure your pond and its equipment is in tip-top shape.
Air pump aeration kits provide large amounts of oxygen and water movement to ponds
Stagnant pond water is not only the most common cause of pond smells, but it can also lead to a whole host of other issues. All types of ponds, with or without fish, will require a stable amount of aeration and water flow to remain healthy. Aeration provides oxygen to fish and bacteria, nutrients to plants, and movement to prevent harmful substance build up.
Aeration can be achieved naturally with water features, such as waterfalls or fountains, or can be achieved with an physical aeration system. If you have a heavy fish stocked pond, we recommend you aerate as much as possible! You cannot over-aerate a pond, so the more oxygen and flow you can provide to the waters, the healthier your fish will be. Having just a filter and pump is often not enough, and ponds would benefit from a fountain , waterfall , or dedicated oxygenation unit .
If you have a smaller pond or a pond that gets plenty of sunlight, you can even install a solar fountain instead of a fountain that requires mains electricity. These are great choices for extra aeration and water movement with no monthly running costs attached. They work best in smaller ponds, or as a complement to a larger aeration system in a larger pond with fish.
In winter, if your pond freezes over regularly, a
de-icer should be installed on the surface to ensure gas exchange can take place and fish can get oxygen.
Natural Bacteria Product
Without a healthy filtration system, waste substances have no way of being effectively removed and will gradually accumulate in your pond. For ponds with goldfish or koi, a dedicated
filtration unit is required to keep pond water clean and healthy. If you already have a filter system, be sure to regularly clean the mechanical media to prevent it from clogging. You could also try replacing the biological media with a more optimized variety to improve the number of beneficial bacteria present. Supplementing with beneficial bacteria products will also help reduce smells in the pond as more bacteria will be available to break down waste substances, like ammonia, which can contribute to bad water odors.
If you have a wildlife pond without fish and no filter box, you will need a good amount of pond plants and preferably a fountain or waterfall. Without a filter unit, plants will be responsible for the absorption of excess nutrients that can cause smells, so the more the better! Even in a natural pond there will be beneficial bacteria present to aid in this process of substance breakdown, so supplementing with natural bacteria products can also help give a fishless pond a good boost in levels.
Activated carbon can also be added to the filter box of a pond to provide a third stage of filtration, alongside the normal mechanical and biological filtration. Activated carbon removes harsh chemicals that normal media cannot handle, and is also able to remove substances which contribute and cause smelly water.