FAQ

The answer to many common questions, such as what the cleaning process includes, how often it’s recommended, and what maintenance plans are available, can be found here in our maintenance plan guide. 

How long does a cleaning take?

Most cleanings take anywhere from a few hours to a full day, depending on the pond’s size and level of debris.

What happens to my fish during cleaning?

Fish are carefully removed and placed in aerated holding tanks filled with existing pond water to minimize stress. They are returned once the pond is refilled and treated. Tadpoles and small aquatic plants can also be placed in the holding tanks during the process. 

How is debris disposed of?

In most cases, we leave debris on-site since it makes excellent fertilizer. We spread it out and place it where it will provide the most benefit while keeping the area looking clean. If you’d like it in a specific spot, just let us know—we’re happy to accommodate. If hauling away is required instead, additional fees may apply.

Who handles refilling the pond?

We try to reuse pond water whenever possible. If the water is too dirty, we refill using the property’s outdoor spigot.

For maintenance instructions on the Anjon BioPro filter line, watch this video. The information presented may also apply to other biological and pressure filters.

Biofiltration

What does a biofilter do? 

A biofilter houses colonies of beneficial bacteria that consume/convert harmful fish waste and other organic debris. By consuming the same nutrients that algae depend on, these bacteria compete directly with algae for food, helping to prevent green water. This “biological filtration” not only keeps pond water safe for fish and plants but also reduces algae growth and provides the backbone of a balanced pond ecosystem.

What kinds of biofilters are there/what does it look like? 

The main types of biofilters that we use are:

• All-in-One Filter/Fountain – A single unit that combines a pump, biological filter media, and a UV clarifier. Simple to install and best for small ponds or decorative water features. Often comes with nozzles to function as a fountain or it can be plumbed to a waterfall or stream. 

• Canister Filter – A compact, pressurized filter (often hidden near the pond) that pushes water through mechanical and biological media. Many models also include a UV light. Ideal for smaller ponds and features where space is limited.

• BioFalls® / Waterfall Weir – A waterfall box that functions as a biological filter. Filled with filter mats and bio media, filtration occurs as water passes up through the mats and creates the start of the waterfall or stream. 

• Wetland / Bog Filter – The largest and most natural biofilter system. Built as a planted bed with layers of rock and gravel, it allows water to rise slowly through media and plant roots, offering huge surface area for beneficial bacteria. Best for large ponds with lots of fish or "rec ponds" for swimming.

How often should I backwash or manually clean my biofilter?

Cleaning frequency can range from as often as once or twice a week to as little as once every couple of months. It depends on factors like pond size, fish and plant load, filter size, and how thoroughly it was last cleaned. We recommend starting with a bi-weekly or monthly schedule and adjusting from there. If the filter clogs, water flow slows down, or debris appears caked inside, you should flush it more often. If you flush it and the water remains clear, you can likely extend the time between cleanings.

UV Filtration

My pond doesn't have a filter. Should I get a biological filter or a UV clarifier? 

We never recommend relying on UV alone. A UV clarifier keeps water clear by targeting algae and microorganisms, but it does not replace a biological filter. A biofilter is essential for breaking down fish waste and maintaining healthy water quality. UV is best used as a supplement to a biofilter on ponds susceptible to algae growth, not as a substitute.

What does a UV filter do? 

A UV filter (or UV clarifier/sterilizer) exposes the pond water to ultraviolet light. It consists of a bulb housed within a quartz sleeve This kills or neutralizes free-floating algae, bacteria, and parasites, preventing them from reproducing. The result is clearer water and reduced pathogen load, though it does not remove debris or waste.

Should I run my UV filter year-round? 

No, you should not. There's no reason to run your UV filter in the winter, as there is no algae growth. Doing so only wastes electricity and weakens the effectiveness of your bulb

How often should I replace the UV bulb? 

Replace the UV bulb every 9–12 months of continuous use (1-2 years of operation), even if it still glows. UV intensity fades with runtime, so a bulb that looks fine to the eye may no longer be effective at controlling algae.

How long does it take to install a pond?

Most backyard ponds can be installed in 3–7 days, depending on size, complexity, and landscaping. Larger water features or those with extensive rockwork, streams, or lighting may take longer.

Do I need a permit to build a pond?

In most residential settings, ponds don’t require permits unless they are very large or tie into stormwater systems. We’ll advise you if any local approvals are needed.

How deep should a pond be?

For ornamental or decorative ponds, 18–24 inches is common. For ponds with fish, especially koi, we recommend at least 2–3 feet deep to protect them from predators and temperature swings.

Can my pond include a waterfall or stream?

Absolutely. In fact, it's almost essential. Ponds need circulation and aeration, and filters like the BioFalls® line integrate directly into the circulation system to provide essential filtration while creating a stream or waterfall. You’ll enjoy the sights and sounds of running water while also keeping your pond clearer and healthier - a win all around! 

How do I start the process? 

Fill out our request form here! Please include photos of the space you'd like to build in and example photos of the style, size, etc. that you like. We require a deposit ($200-500, depending on size & complexity) that includes design & consultation. We'll schedule a time to meet, look at the space, and come up with a plan and design. If you decide to move forward with the project, the deposit is applied to the total cost of the job. 

Can I add fish and plants right away?

We recommend waiting a short period (usually 1–2 weeks) after installation for the water to stabilize and beneficial bacteria to establish before adding fish. Aquatic plants can be added right away. 

What kind of maintenance will my pond need?

All ponds require some upkeep, including seasonal cleaning, debris removal, and filter maintenance. We offer maintenance plans to keep your water feature running smoothly year-round.

I want a water feature, but low maintenance. Do I need a pond?

Consider a pondless waterfall! One of our favorite water features gives you the sights and sounds of moving water without the upkeep of fish or standing water. The water flows into a hidden underground reservoir and recirculates, making it a great choice for those who want the beauty of a water feature with minimal maintenance. 

Do I need to shut down my pond in the winter?
Not always. Some ponds can run year-round, but shutting down helps protect equipment and reduces electricity costs. We recommend winterization if you don’t plan to enjoy your pond during cold months.

When should I schedule winterization?
We recommend booking before consistent freezing temps set in - usually mid-to-late fall, depending on the season.

What happens to the fish in winter?
If your pond is at least 2–3 feet deep, fish typically overwinter just fine. We recommend using an aerator or floating de-icer to keep a small hole open in the ice so oxygen can circulate.

Do I need to remove the pump?
Yes, in most cases. Submersible pumps are removed, cleaned, and stored indoors to prevent damage from freezing. If left in, freezing water can crack pump housings.

What about my filters and UV lights?
Filters, UV clarifiers, and skimmers are drained, cleaned, and disconnected to prevent freeze damage. UV bulbs should also be stored indoors and replaced in the spring if due.

Do I need to drain the pond completely?
No. Most ponds are left filled. Draining is only necessary for shallow ponds that risk freezing solid.

Can I leave a waterfall or stream running in winter?
You can, but with caution. If temperatures drop below freezing for a prolonged period of time, you need a heater and to pay close attention to ice formation. The risk is that ice dams can form and divert water out of the pond, quickly draining it. Frozen pipes also pose a risk, as expanding ice can cause them to crack or burst.