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my fish are dying

Gold Label Under Water Sealant

Gold Label Under Water Sealant

Frequent Questions When Using Gold Label Under Water Sealant

Gold Label Under Water Sealant

Pondh2o Underwater Sealant Made By Gold Label is a cost effective And quick way of fixing all types of Pond leaks, which any pond owner will tell you is a stressful event.
We get asked many times on the best way to use the sealant so we have made up a quick checklist to help you fix that leak fast!

Most asked question is what will Gold Label Under Water Sealant seal:

Vinyl (abrade surface)
Composite Plastics
Concrete (use a suitable primer 1st)
Butyl Rubber (Pond Liner)


For best results ensure surface is clean and free of grease/algae etc. Gold Label Under Water Sealant needs to be in contact with the surface that you require the seal.
Pipe the sealer using a sealant gun (for full sized product) directly on to the surface you wish to seal/bond.  Ensuring a thick enough bead in order for the product to work.  Gold Label Pond & Aquarium Sealer is not glue but a sealant, gently push the patch if using on on gently , careful not to push the sealant out. For bonding where there is movement (expansion/contraction) between surfaces, allow a minimum 2mm thickness of beading.

When attaching different liners together, for best results use 2 lines of beading 150mm ( 6 inches) apart. Full curing time is approximately 24 hours but will be touch dry after 2-3 hours.  If using the clear version of the sealer, full cure time is approximately 36 hours as this version is less dense. Please note: should fish be present, protect from ingestion whilst curing. Should you wish to paint over the sealant, this can be done up to 4 hours after application. Do not use below 10 °C (5o Degrees) air or surface temperature. Shelf life up to 12 months in ambient conditions (10-25°C).

Gold Label Pond Sealant

Gold Label Pond Liner Repair Patch

Pond H2O Has All The Equipment You Need!

For all ponds, big and small Pond H2o has the supplies you need to make your dream water feature come to life! When we say we have all the supplies you need, we mean it, we are a one-stop shop for all that you need. From an all-in-one pond kit to maintenance care and accessories, we have you covered! If you have any questions call us at 856-985-9339 or email us at info@pondh2o.com.

Tips for Raising Baby Koi Fish

Tips for Raising Baby Koi Fish or Fry

Many aquatic enthusiast develop a personal attachment to their koi and their offspring. A great amount of satisfaction is achieved by breeding your own fish, and also shows you are doing everything right in regards to water quality, oxygen levels etc.

Here are some tips for raising baby koi fish or fry:

  • **Separate Tank:** They often move the eggs or newly hatched fry to a separate tank or pond. This allows for better control over water quality, temperature, and conditions specifically tailored for the fry’s growth.
  • **Water Quality:** Ensuring optimal water quality is crucial. This includes maintaining proper pH levels, ammonia and nitrite levels, and providing good aeration and filtration to keep the water clean.
  • **Feeding:** Fry are fed specialized food that is designed for their small size and nutritional needs. This can include commercial fry food, finely crushed flakes, or specially formulated fry pellets. Feeding frequency and amount should be monitored to prevent overfeeding.  Overfeeding will lead to water quality issues.

Tips for Raising Baby Koi Fish Fish Care Aids here at PondH2o

  • **Shelter:** Providing shelter, such as plants or artificial structures, helps the fry feel secure and reduces stress. It also gives them places to hide from potential predators.
  • **Monitoring:** Enthusiasts closely monitor the fry’s growth, behavior, and overall health. Any signs of illness or issues with water quality should be addressed promptly.
  • **Gradual Introduction:** As the fry grow, they can be gradually introduced to larger tanks or ponds with older koi. This transition is carefully managed to minimize stress and ensure compatibility with the existing population.

By following these tips for raising baby fish or fry and providing proper care, koi enthusiasts or anyone can raise healthy and vibrant koi fry into mature adults.

For all ponds, big and small Pond H2o has the supplies you need to make your dream pond come to life! When we say we have all the supplies you need, we mean it, we are a one-stop shop for all that you need. From an Fish Care Items to maintenance care and accessories, we have you covered!

If you have any questions call us at 856-985-9339 or email us at info@pondh2o.com. Our Facebook page for latest news and information.

What are Ultra Violet Light Clarifiers (UVC)

What are Ultra Violet Light Clarifiers (UVC)

Ultra Violet Light Clarifiers (UVC) are most commonly used in a koi or backyard pond to get rid of that dreaded single cell algae, aka green soup. UVC as they are commonly known in short form are added inline from the pump to the filter.  Some filters are made with integrated UVC’s. The main and only aim of these is to sterilize the pond water as it passes through, basically they zap it!

7 Watt PLS UVC Bulb Gx23 Base, Ultra Violet Light Clarifiers (UVC)

So how do they work?

Inside the unit is a replaceable UV light.  These are effective for around 8000 hours so remember to replace Ultra Violet Light Clarifiers (UVC) at least annually.  He here at Pondh2o we stock all types and sizes for nearly every machine in the US pond market. Check out our large selection of UV Germicidal Bulbs.

They work by using 253NM light wavelength to sterilize the water as it passes the bulb.  Like bacteria, algae cells are totally safe for you and will not effect water chemistry.  Most important, always remember never look at a naked UV bulb as it can damage your eyes.

Things to Note:

Always keep the quartz sleeve clean.  This protects from the bulb from contact with the pond water, or would be like driving with a dirty windshield.  Check any chemicals you may add to ensure they are not affected by UV light.  Change the bulb at least every 12 month, even better every 6 months if you can afford it.

What is the difference between a Clarifier and Sterilizer

Sterilizers which are basically the same except for that they sterilize as the name suggests. Commonly used in the commercial aquaculture industry as another line of defense in preventing major parasite and bacteria outbreaks, the No1 aim is to get rid of and kill just about everything that passes by. To accomplish this they need to have a longer contact time with the water. Sterilizers require extremely slow flow rates so are not really suitable for backyard ponds that require higher flow rates for oxygen and filtration.

For all ponds, big and small Pond H2o has the supplies you need to make your dream pond come to life! When we say we have all the supplies you need, we mean it, we are a one-stop shop for all that you need. From an all-in-one pond kits to maintenance care and accessories, we have you covered! If you have any questions call us at 856-985-9339 or email us at info@pondh2o.com. Our Facebook page for latest news and information.

Complete Kits Closing a koi fish pond PondH2o Products

Closing a Koi Fish Pond

Closing a koi fish pond properly is crucial for the well-being of your fish and the water garden. Here are seven crucial steps to follow that ensure a smooth spring:

  1. Gradual feeding reduction: Stop feeding your koi fish about two weeks before you plan to close the pond to allow them to digest their food.
  2. Water quality check: Test the water and make sure it’s in good condition. You may need to do a partial water change if necessary.
  3. Remove debris: Clean the pond by removing any debris, fallen leaves, and algae. This helps maintain water quality.
  4. Pond Cover Netting: Cover the pond with a sturdy net to prevent leaves, debris, and predators from getting in.
  5. Aeration and circulation: Keep your pond’s aeration and circulation systems running, especially if you expect freezing temperatures. This prevents the water from completely freezing over.
  6. Insulate the pump and filter: If you live in a cold climate, insulate your pond’s pump and filter to protect them from freezing.
  7. Secure shelters: If your area experiences harsh winters, consider adding a koi shelter or heat source to keep the water temperature stable.

By following these steps, you can help ensure the health and safety of your koi fish during the closed season.  Pond H20 has all the pond products you need for closing a koi fish pond!

Closing a Koi Fish Pond and Water Garden for the Season


For all ponds, big and small Pond H2o has the supplies you need to make your dream pond come to life! When we say we have all the supplies you need, we mean it, we are a one-stop shop for all that you need. From an all-in-one pond kits to maintenance care and accessories, we have you covered! If you have any questions call us at 856-985-9339 or email us at info@pondh2o.com. Our Facebook page for latest news and information.

EPDM Pond liner

Here Are Some Facts and Benefits for Using EPDM Pond liner

Here Are Some Facts and Benefits for Using EPDM Pond liner.  At Pond H2o, we have a bevy of pond liners you can purchase to keep your water garden pristine and healthy.  Today, however, we will be specifically assessing the effectiveness of EPDM pond liner, an option that offers both high quality and flexibility.

It provides versatility

Benefits for Using EPDM Pond liner

A koi pond under construction by Biofilter tech via Wikimedia Commons.

Ethylene Propylene Diene Monomer (EPDM) pond liners are also known as one of the more flexible pond liners on the market. In other words, they can be used to form sizes and shapes at your discretion.  Typically, one sheet of EPDM rubber will be sufficient enough to meet the needs of your average pond. However, this will depend on your pond’s size. If yours is on the larger side, you can use multiple liners.

Easy Installation

Another of the benefits for using EPDM pond liner and a testament to pond liners, especially with the EPDM variation, is its simple installation. You don’t have to be a professional to install this pond liner. Although it should be noted that you will need butyl tape and top quality pond adhesive, like PondH2o’s product Gold Label sealant, to make sure the seams are waterproofed.

The quality is ensured

Benefits for Using EPDM Pond liner

Seaming a EPDM pond liner by Aquascape Ponds via YouTube.

There are other flexible pond liners that have trouble holding up over the course of time. However, EPDM liners provide your water garden koi fish pond with longevity—enabling you to save money in the long run. 

For example, if you opt for a low-grade plastic or vinyl pond liner, there’s a higher chance it will eventually develop cuts and tears. Another variation known as PVC liners—typically found in above ground swimming pools —tend to be susceptible to punctures, too. PVC Pond Liners have a great starting price point and are easy to install, but can dry out in the sunlight.  With EPDM liners, however, the material is much more resilient and longer lasting. 


And there’s a practical reason for this. EPDM liners were originally made for flat roofs so that they can be more water resistant over time. However, once this liner became popularized and buyers made aware of its sturdy material, EPDM liners soon became one of the most widely used pond liners in the U.S.

After installation, you can be assured these are qualified for your pond and are fish friendly. And while there is no perfectly impervious pond liner on the market, this will provide you with much more resiliency and flexibility than the average.

It is important to note that since EPDM liners are made from high quality materials, they tend to be more expensive than its competitors. Although as the old adage goes, ‘you get what you pay for,’ and this is certainly the case with this variant. 

In the long run, you will be much less likely to replace this with other liners. In addition, an EPDM pond liner will withstand  harsh, colder climates, too. 

As far as upkeep, the most salient matter is to make sure your EPDM pond liner is consistently obfuscated from sunlight. Otherwise, the strength of the lining material can weaken over time.

Buy our fish pond liners designed to fit every budget today to get started, including from our EPDM, LDPE, and other pond liners.

Be sure to check out our Information Center for other Pond Blogs.  As always, remember to check our Facebook page for coupons and news.

New Pond Syndrome

What Is New Pond Syndrome

New Pond Syndrome is just the title used for when a pond is first put in place and goes through the maturing cycle or more exactly the Nitrogen Cycle.  Like anything new that is to support life it needs seeding and kick starting to help it mature.

So what is New Pond Syndrome?

The Nitrogen cycle starts off with Ammonia (NH3) which in turn through the nitrification cycle is Nitrite (No2) this then turns in to Nitrate (No3) which plants love and also single cell algae or greenwater. This process if not completed quickly creates the saying – New Pond Syndrome. It usually takes between 4 to 8 weeks to complete but depends on many factors explained here.

Always make sure you are filtering the pond every two hours through a pond filter that can support the water volume and fish load or you will be forever fighting a losing battle.

How Does New Pond Syndrome effect the Fish

Initially if fish are put in the pond quickly after installed you will see little difference if dechlorinator was used or 24 hours passed from filling the pond. But over days or even weeks ammonia and nitrites will build from fish food, fish waste and start to stress the fish, making them rise to the surface for more oxygen. The reason why this is happening is the good bacteria is not colonizing quickly enough in the filter or gravel to push the pond through the nitrogen cycle.

Five easy steps of helping the cycle along enjoying your pond creation:

  1. While ammonia can be used by some plants, most of the nitrogen taken up by plants is converted by bacteria from ammonia – which is highly toxic to many organisms – into nitrite (NO2-), and then into nitrate (NO3-). This process is called nitrification, and these bacteria are known as nitrifying bacteria. Use a Beneficial Bacteria that will jump start this nitrification process when the pond was first installed.
  2. Make regular water changes of up to 25% to help keep the water conditions good for the fish.
  3. Do not add pond fish quickly, just start with one or two and then add a few more every 14 days or so till the fish load is correct for the filter and pond water volume.
  4. Keep the oxygen levels high in the pond, helps turbocharge the good bacteria. Proper pond aeration products is the key
  5. Buy a good water test kit to test the levels.

Completing proper water testing on your water garden pond will help prevent new pond syndrome.  Read more articles in our information center.




Pond Water Chemistry

Pond Water Chemistry

Knowing about your water garden koi fish pond water chemistry is essential to a Happy & Healthy pond. However, several variables influence water quality for plants, flowers, fish and aquatic life including water temperature, nitrates and pH, carbon dioxide, alkalinity and hardness. Additionally, water quality can be affected by the interaction of these factors and others.

When you initially setup your koi fish pond and fill with water, there is no natural bacteria available to digest fish waste and ammonia omitted from the fish’s gills. There are a number of bacteria additives that you can introduce. Using these additives will speed up the balancing procedures of your pond. Over a period of weeks the pond will go through the nitrogen cycle. The first issue to be aware of is a potential rise in nitrates (NO2), if this happens, stop feeding and do a partial water change.

Rising NO2 levels are toxic to aquatic life. Causing fish to become sedentary and lethargic ultimately killing your prized koi pond. The bacteria additive will turn the NO2 into NO3, which are far less harmful to fish, and extremely beneficial to aquatic plant life.  A single cell algae will bloom as green pea soup. At this point the pond is becoming balanced, and adding an algaecide or bacteria will help balance the water in your pond.

The best advice anyone could give regarding your pond water chemistry and about the nitrogen cycle is arm yourself with a water test kit so you are fully aware of what your pond water is doing. Proper cleaning, testing and maintenance will keep your water garden pond water within range to eliminate water problems.

Choosing a Location for your Pond

Choosing a Location for your Pond

Choosing a location for your pond takes some careful consideration. Read our tips below to make sure you pick the perfect place in your garden.

  1. Install your pond on level ground with good drainage.
  2. Plan the most direct line possible between the house and pond if you will be needing electrical wiring for pond pumps or filters for example.
  3. Contact your local municipality to determine if a permit is required.
  4. Make sure the site isn’t directly over any underground pipes, cables, wires, sprinklers or septic systems!
  5. Being near an outdoor faucet so you can add water to the pond from a garden hose would be very helpful.
  6. The more sunlight the pond gets each day, the more choices of water plants you have. If adding fish to your pond, a balance of sun with some shade during the hottest part of the day is best. Try adding water lilies or lotus pads, reeds, shrubs and grasses as additional shade options.
  7. Avoid choosing a location for your pond near large trees or in open windy areas. Falling leaves and needles contaminate the water and collect on the bottom of the pond.

You’ll find many products for your pond within our online pond supply store. Read more on our blog on How to Dig a Pond https://www.pondh2o.com/2019/07/03/how-to-dig-a-pond/ and Installing a Pond Liner https://www.pondh2o.com/2019/07/03/installing-pond-liner/.


Call 811 from anywhere in the country a few days prior to digging, and your call will be routed to your local one call center. Tell the operator where you’re planning to dig . Your affected local utility companies will be notified about your intent to dig and will send locators to your dig site to mark the approximate location of buried lines with flags or paint.

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