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Ornamental ponds need supplemental filtration to maintain proper water quality. Filtration involves two parts.

The first step is mechanical. This step removes particles from the water like leaves, grass clippings, dead plant foliage, etc. Pond Skimmers are simply the best way to catch debris that falls into your pond and they are a great mechanical pond filter.

The second stage is biological filtration and is especially important for ponds with fish. Biological filtration keeps the water healthy and clear. The filter media inside a bio-filter collects beneficial bacteria which cleans the water as it passes through the filter.

Sizing Your Filter
All pond filters are rated for maximum pond size or maximum GPM flow. To properly filter the pond your filter needs to be able to filter half the pond volume per hour at a minimum.

Example: A 1,000 gallon pond needs a minimum of a 500 gallons per hour filter. Make sure your pump flow dos not exceed the filter flow or it will not work and could break. Call us and we can help.

Filter Location
We recommend using an external biological filter. This filter can be located directly next to the pond or concealed by plants, rocks or bushes away from the pond. Typically you would put the biological filter within a few feet of your waterfall. Water is pumped from the pond through piping to the filter and then back to the pond. Typically a pressurized filter or Aquafallsare used. Aquafalls filters can be ideal since they bury in the ground for easy concealment, require minimal cleaning, and provide your waterfall or beginning to a stream. Typical layout with skimmer and Aquafall.

Aquatic plants are an important part of the filter system. Plants absorb nutrients from the water thereby reducing the nutrient load in the pond which helps your filters. Oxygenating plants are especially beneficial because they not only filter, they also add oxygen to the water.

UV Clarifiers
Ultraviolet clarifiers are a popular way to control pea soup colored water. Pea soup green water is caused by an excess of free floating algae cells. They destroy all living cells in the water as it passes through the unit, the UV actually burst the algae spores. Likewise if water flows to fast the UV can’t do the job, so it is critical to match the correct UV and water pump. When adding bacteria to your pond that has a UV unit, you will want to shut off the UV before adding the bacteria, then restart after 24 hours.

We hope this was helpful to you. Please feel free to call, blog, email or tweet us with any questions or comments.

The Pond Warehouse


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  • Atwaterandrew

    Pond Filters

    Pond filter is the most important single component of a beautiful and healthy pond. Two types of filtration, mechanical and biological, are necessary. Some filter designs incorporate both functions into a single filtration process. Other proposals strictly carry out only one or the other functions.